20121032555 has 16 divisors (see below), whose sum is σ = 26232685920. Its totient is φ = 14727111168.

The previous prime is 20121032497. The next prime is 20121032597. The reversal of 20121032555 is 55523012102.

It is a cyclic number.

It is not a de Polignac number, because 20121032555 - 2²⁸ = 19852597099 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1362365 + ... + 1377054.

It is an arithmetic number, because the mean of its divisors is an integer number (1639542870).

Almost surely, 2^20121032555 is an apocalyptic number.

20121032555 is a deficient number, since it is larger than the sum of its proper divisors (6111653365).

20121032555 is a wasteful number, since it uses less digits than its factorization.

20121032555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2739550.

The product of its (nonzero) digits is 3000, while the sum is 26.

Adding to 20121032555 its reverse (55523012102), we get a palindrome (75644044657).

The spelling of 20121032555 in words is "twenty billion, one hundred twenty-one million, thirty-two thousand, five hundred fifty-five".