21507244313 has 16 divisors (see below), whose sum is σ = 22979816640. Its totient is φ = 20070792000.

The previous prime is 21507244309. The next prime is 21507244331. The reversal of 21507244313 is 31344270512.

It is a cyclic number.

It is not a de Polignac number, because 21507244313 - 2² = 21507244309 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21507244313.

It is not an unprimeable number, because it can be changed into a prime (21507244613) 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, 349598 + ... + 406488.

It is an arithmetic number, because the mean of its divisors is an integer number (1436238540).

Almost surely, 2^21507244313 is an apocalyptic number.

It is an amenable number.

21507244313 is a deficient number, since it is larger than the sum of its proper divisors (1472572327).

21507244313 is a wasteful number, since it uses less digits than its factorization.

21507244313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57208.

The product of its (nonzero) digits is 20160, while the sum is 32.

The spelling of 21507244313 in words is "twenty-one billion, five hundred seven million, two hundred forty-four thousand, three hundred thirteen".