21016670715 has 24 divisors (see below), whose sum is σ = 36434743488. Its totient is φ = 11207091840.

The previous prime is 21016670683. The next prime is 21016670747. The reversal of 21016670715 is 51707661012.

It is an interprime number because it is at equal distance from previous prime (21016670683) and next prime (21016670747).

It is not a de Polignac number, because 21016670715 - 2⁵ = 21016670683 is a prime.

It is a super-2 number, since 2×21016670715² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21016670715.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 274510 + ... + 342620.

It is an arithmetic number, because the mean of its divisors is an integer number (1518114312).

Almost surely, 2^21016670715 is an apocalyptic number.

21016670715 is a deficient number, since it is larger than the sum of its proper divisors (15418072773).

21016670715 is a wasteful number, since it uses less digits than its factorization.

21016670715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74979 (or 74976 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The spelling of 21016670715 in words is "twenty-one billion, sixteen million, six hundred seventy thousand, seven hundred fifteen".