21112025391 has 24 divisors (see below), whose sum is σ = 30580158960. Its totient is φ = 14035504896.

The previous prime is 21112025329. The next prime is 21112025411. The reversal of 21112025391 is 19352021112.

21112025391 is a `hidden beast` number, since 2 + 1 + 1 + 120 + 2 + 539 + 1 = 666.

It is not a de Polignac number, because 21112025391 - 2¹¹ = 21112023343 is a prime.

It is a super-2 number, since 2×21112025391² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112025791) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8090695 + ... + 8093303.

It is an arithmetic number, because the mean of its divisors is an integer number (1274173290).

Almost surely, 2^21112025391 is an apocalyptic number.

21112025391 is a deficient number, since it is larger than the sum of its proper divisors (9468133569).

21112025391 is a wasteful number, since it uses less digits than its factorization.

21112025391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4775 (or 4772 counting only the distinct ones).

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

The spelling of 21112025391 in words is "twenty-one billion, one hundred twelve million, twenty-five thousand, three hundred ninety-one".