21237511422 has 48 divisors (see below), whose sum is σ = 43282865808. Its totient is φ = 6945724800.

The previous prime is 21237511397. The next prime is 21237511429. The reversal of 21237511422 is 22411573212.

It is a self number, because there is not a number n which added to its sum of digits gives 21237511422.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21237511429) 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, 30295672 + ... + 30296372.

It is an arithmetic number, because the mean of its divisors is an integer number (901726371).

Almost surely, 2^21237511422 is an apocalyptic number.

21237511422 is an abundant number, since it is smaller than the sum of its proper divisors (22045354386).

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

21237511422 is an equidigital number, since it uses as much as digits as its factorization.

21237511422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1305 (or 1042 counting only the distinct ones).

The product of its digits is 6720, while the sum is 30.

The spelling of 21237511422 in words is "twenty-one billion, two hundred thirty-seven million, five hundred eleven thousand, four hundred twenty-two".