21252675631 has 16 divisors (see below), whose sum is σ = 23512550400. Its totient is φ = 19049044000.

The previous prime is 21252675629. The next prime is 21252675641. The reversal of 21252675631 is 13657625212.

It is a cyclic number.

It is not a de Polignac number, because 21252675631 - 2¹ = 21252675629 is a prime.

It is a super-2 number, since 2×21252675631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252675641) 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, 225510 + ... + 305548.

It is an arithmetic number, because the mean of its divisors is an integer number (1469534400).

Almost surely, 2^21252675631 is an apocalyptic number.

21252675631 is a deficient number, since it is larger than the sum of its proper divisors (2259874769).

21252675631 is a wasteful number, since it uses less digits than its factorization.

21252675631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80390.

The product of its digits is 151200, while the sum is 40.

The spelling of 21252675631 in words is "twenty-one billion, two hundred fifty-two million, six hundred seventy-five thousand, six hundred thirty-one".