1221212 has 12 divisors (see below), whose sum is σ = 2262960. Its totient is φ = 574656.

The previous prime is 1221197. The next prime is 1221221. The reversal of 1221212 is 2121221.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1221193 and 1221202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8912 + ... + 9047.

It is an arithmetic number, because the mean of its divisors is an integer number (188580).

2^1221212 is an apocalyptic number.

It is an amenable number.

1221212 is a deficient number, since it is larger than the sum of its proper divisors (1041748).

1221212 is a wasteful number, since it uses less digits than its factorization.

1221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17980 (or 17978 counting only the distinct ones).

The product of its digits is 16, while the sum is 11.

The square root of 1221212 is about 1105.0846121452. The cubic root of 1221212 is about 106.8883454033. Note that the first 3 decimals are identical.

Adding to 1221212 its reverse (2121221), we get a palindrome (3342433).

Subtracting 1221212 from its reverse (2121221), we obtain a palindrome (900009).

It can be divided in two parts, 1221 and 212, that multiplied together give a palindrome (258852).

The spelling of 1221212 in words is "one million, two hundred twenty-one thousand, two hundred twelve".