21624379713 has 6 divisors (see below), whose sum is σ = 31235215154. Its totient is φ = 14416253136.

The previous prime is 21624379687. The next prime is 21624379723. The reversal of 21624379713 is 31797342612.

21624379713 is a `hidden beast` number, since 2 + 1 + 624 + 3 + 7 + 9 + 7 + 13 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17037297729 + 4587081984 = 130527^2 + 67728^2 .

It is not a de Polignac number, because 21624379713 - 2⁶ = 21624379649 is a prime.

It is a super-2 number, since 2×21624379713² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21624379723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1201354420 + ... + 1201354437.

Almost surely, 2^21624379713 is an apocalyptic number.

It is an amenable number.

21624379713 is a deficient number, since it is larger than the sum of its proper divisors (9610835441).

21624379713 is a wasteful number, since it uses less digits than its factorization.

21624379713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2402708863 (or 2402708860 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The spelling of 21624379713 in words is "twenty-one billion, six hundred twenty-four million, three hundred seventy-nine thousand, seven hundred thirteen".