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1212 = 223101

1212 has 12 divisors (see below), whose sum is σ = 2856. Its totient is φ = 400.

The previous prime is 1201. The next prime is 1213. The reversal of 1212 is 2121.

It is a happy number.

1212 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is an alternating number because its digits alternate between odd and even.

1212 is an undulating number in base 10.

It is a plaindrome in base 15 and base 16.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 1212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213) by changing a digit.

1212 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39 + ... + 62.

It is an arithmetic number, because the mean of its divisors is an integer number (238).

21212 is an apocalyptic number.

1212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1212 is an abundant number, since it is smaller than the sum of its proper divisors (1644).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1428).

1212 is a wasteful number, since it uses less digits than its factorization.

1212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 106 counting only the distinct ones).

The product of its digits is 4, while the sum is 6.

The square root of 1212 is about 34.8137903711. The cubic root of 1212 is about 10.6618902226.

Adding to 1212 its reverse (2121), we get a palindrome (3333).

Subtracting 1212 from its reverse (2121), we obtain a palindrome (909).

It can be divided in two parts, 121 and 2, that multiplied together give a palindrome (242).

The spelling of 1212 in words is "one thousand, two hundred twelve", and thus it is an iban number.

Divisors: 1 2 3 4 6 12 101 202 303 404 606 1212