21113161031025 has 120 divisors (see below), whose sum is σ = 44698429843584. Its totient is φ = 9651174624000.

The previous prime is 21113161030999. The next prime is 21113161031041. The reversal of 21113161031025 is 52013016131112.

21113161031025 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 31 + 610 + 3 + 10 + 2 + 5 = 666.

It is not a de Polignac number, because 21113161031025 - 2⁵ = 21113161030993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 21113161031025.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 342309589 + ... + 342371261.

Almost surely, 2^{21113161031025} is an apocalyptic number.

21113161031025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21113161031025 is an abundant number, since it is smaller than the sum of its proper divisors (23585268812559).

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

21113161031025 is a wasteful number, since it uses less digits than its factorization.

21113161031025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85853 (or 85839 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

Adding to 21113161031025 its reverse (52013016131112), we get a palindrome (73126177162137).

The spelling of 21113161031025 in words is "twenty-one trillion, one hundred thirteen billion, one hundred sixty-one million, thirty-one thousand, twenty-five".