21244236492 has 48 divisors (see below), whose sum is σ = 50401274112. Its totient is φ = 6962729280.

The previous prime is 21244236413. The next prime is 21244236493. The reversal of 21244236492 is 29463244212.

It is a self number, because there is not a number n which added to its sum of digits gives 21244236492.

It is not an unprimeable number, because it can be changed into a prime (21244236493) 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, 3632923 + ... + 3638765.

It is an arithmetic number, because the mean of its divisors is an integer number (1050026544).

Almost surely, 2^21244236492 is an apocalyptic number.

It is an amenable number.

21244236492 is an abundant number, since it is smaller than the sum of its proper divisors (29157037620).

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

21244236492 is a wasteful number, since it uses less digits than its factorization.

21244236492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10878 (or 10876 counting only the distinct ones).

The product of its digits is 165888, while the sum is 39.

The spelling of 21244236492 in words is "twenty-one billion, two hundred forty-four million, two hundred thirty-six thousand, four hundred ninety-two".