21640204700739 has 24 divisors (see below), whose sum is σ = 31817115832320. Its totient is φ = 14169233492208.

The previous prime is 21640204700693. The next prime is 21640204700743. The reversal of 21640204700739 is 93700740204612.

It is not a de Polignac number, because 21640204700739 - 2⁹ = 21640204700227 is a prime.

It is a super-2 number, since 2×21640204700739² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21640204700694 and 21640204700703.

It is not an unprimeable number, because it can be changed into a prime (21640204700759) 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, 18168747 + ... + 19323140.

It is an arithmetic number, because the mean of its divisors is an integer number (1325713159680).

Almost surely, 2^{21640204700739} is an apocalyptic number.

21640204700739 is a deficient number, since it is larger than the sum of its proper divisors (10176911131581).

21640204700739 is a wasteful number, since it uses less digits than its factorization.

21640204700739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37493039 (or 37493036 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

The spelling of 21640204700739 in words is "twenty-one trillion, six hundred forty billion, two hundred four million, seven hundred thousand, seven hundred thirty-nine".