21130320344 has 32 divisors (see below), whose sum is σ = 46840615200. Its totient is φ = 8743580160.

The previous prime is 21130320331. The next prime is 21130320353. The reversal of 21130320344 is 44302303112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6504017 + ... + 6507264.

It is an arithmetic number, because the mean of its divisors is an integer number (1463769225).

Almost surely, 2^21130320344 is an apocalyptic number.

It is an amenable number.

21130320344 is an abundant number, since it is smaller than the sum of its proper divisors (25710294856).

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

21130320344 is a wasteful number, since it uses less digits than its factorization.

21130320344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13011323 (or 13011319 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21130320344 its reverse (44302303112), we get a palindrome (65432623456).

The spelling of 21130320344 in words is "twenty-one billion, one hundred thirty million, three hundred twenty thousand, three hundred forty-four".