21132051252 has 48 divisors (see below), whose sum is σ = 53110314432. Its totient is φ = 6501035520.

The previous prime is 21132051211. The next prime is 21132051271. The reversal of 21132051252 is 25215023112.

It is a congruent number.

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, 1519852 + ... + 1533692.

It is an arithmetic number, because the mean of its divisors is an integer number (1106464884).

Almost surely, 2^21132051252 is an apocalyptic number.

It is an amenable number.

21132051252 is an abundant number, since it is smaller than the sum of its proper divisors (31978263180).

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

21132051252 is a wasteful number, since it uses less digits than its factorization.

21132051252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23648 (or 23646 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

Adding to 21132051252 its reverse (25215023112), we get a palindrome (46347074364).

The spelling of 21132051252 in words is "twenty-one billion, one hundred thirty-two million, fifty-one thousand, two hundred fifty-two".