121111212 has 48 divisors (see below), whose sum is σ = 297353952. Its totient is φ = 38315520.

The previous prime is 121111189. The next prime is 121111231. The reversal of 121111212 is 212111121.

It is a Harshad number since it is a multiple of its sum of digits (12).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14878 + ... + 21530.

It is an arithmetic number, because the mean of its divisors is an integer number (6194874).

Almost surely, 2^121111212 is an apocalyptic number.

121111212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121111212 is an abundant number, since it is smaller than the sum of its proper divisors (176242740).

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

121111212 is a wasteful number, since it uses less digits than its factorization.

121111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6738 (or 6736 counting only the distinct ones).

The product of its digits is 8, while the sum is 12.

The square root of 121111212 is about 11005.0539298997. The cubic root of 121111212 is about 494.7602307822.

Adding to 121111212 its reverse (212111121), we get a palindrome (333222333).

Subtracting 121111212 from its reverse (212111121), we obtain a palindrome (90999909).

It can be divided in two parts, 12111121 and 2, that multiplied together give a palindrome (24222242).

The spelling of 121111212 in words is "one hundred twenty-one million, one hundred eleven thousand, two hundred twelve".