12121220232 has 48 divisors (see below), whose sum is σ = 35812698480. Its totient is φ = 3673096800.

The previous prime is 12121220231. The next prime is 12121220263. The reversal of 12121220232 is 23202212121.

12121220232 is a `hidden beast` number, since 1 + 212 + 1 + 220 + 232 = 666.

It is a super-2 number, since 2×12121220232² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (12121220231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7651494 + ... + 7653077.

It is an arithmetic number, because the mean of its divisors is an integer number (746097885).

Almost surely, 2^12121220232 is an apocalyptic number.

12121220232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12121220232 is an abundant number, since it is smaller than the sum of its proper divisors (23691478248).

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

12121220232 is a wasteful number, since it uses less digits than its factorization.

12121220232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15304594 (or 15304587 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 12121220232 its reverse (23202212121), we get a palindrome (35323432353).

The spelling of 12121220232 in words is "twelve billion, one hundred twenty-one million, two hundred twenty thousand, two hundred thirty-two".