21112025051 has 16 divisors (see below), whose sum is σ = 23184208320. Its totient is φ = 19107619200.

The previous prime is 21112024993. The next prime is 21112025063. The reversal of 21112025051 is 15052021112.

It is a cyclic number.

It is not a de Polignac number, because 21112025051 - 2³⁰ = 20038283227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21112025651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57185 + ... + 213293.

It is an arithmetic number, because the mean of its divisors is an integer number (1449013020).

Almost surely, 2^21112025051 is an apocalyptic number.

21112025051 is a deficient number, since it is larger than the sum of its proper divisors (2072183269).

21112025051 is a wasteful number, since it uses less digits than its factorization.

21112025051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156326.

The product of its (nonzero) digits is 200, while the sum is 20.

Adding to 21112025051 its reverse (15052021112), we get a palindrome (36164046163).

The spelling of 21112025051 in words is "twenty-one billion, one hundred twelve million, twenty-five thousand, fifty-one".