12021265156 has 12 divisors (see below), whose sum is σ = 21351202768. Its totient is φ = 5920921512.

The previous prime is 12021265129. The next prime is 12021265171. The reversal of 12021265156 is 65156212021.

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, 22427466 + ... + 22428001.

Almost surely, 2^12021265156 is an apocalyptic number.

It is an amenable number.

12021265156 is a deficient number, since it is larger than the sum of its proper divisors (9329937612).

12021265156 is a wasteful number, since it uses less digits than its factorization.

12021265156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44855538 (or 44855536 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 31.

Adding to 12021265156 its reverse (65156212021), we get a palindrome (77177477177).

The spelling of 12021265156 in words is "twelve billion, twenty-one million, two hundred sixty-five thousand, one hundred fifty-six".