12021265155 has 32 divisors (see below), whose sum is σ = 19464883200. Its totient is φ = 6334499072.

The previous prime is 12021265129. The next prime is 12021265171. The reversal of 12021265155 is 55156212021.

It is a cyclic number.

It is not a de Polignac number, because 12021265155 - 2¹² = 12021261059 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2383126 + ... + 2388164.

It is an arithmetic number, because the mean of its divisors is an integer number (608277600).

Almost surely, 2^12021265155 is an apocalyptic number.

12021265155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12021265155 is a deficient number, since it is larger than the sum of its proper divisors (7443618045).

12021265155 is a wasteful number, since it uses less digits than its factorization.

12021265155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6923.

The product of its (nonzero) digits is 6000, while the sum is 30.

Adding to 12021265155 its reverse (55156212021), we get a palindrome (67177477176).

The spelling of 12021265155 in words is "twelve billion, twenty-one million, two hundred sixty-five thousand, one hundred fifty-five".