21716965365 has 16 divisors (see below), whose sum is σ = 34811385216. Its totient is φ = 11560968000.

The previous prime is 21716965357. The next prime is 21716965373. The reversal of 21716965365 is 56356961712.

It is an interprime number because it is at equal distance from previous prime (21716965357) and next prime (21716965373).

It is not a de Polignac number, because 21716965365 - 2³ = 21716965357 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1329961 + ... + 1346190.

It is an arithmetic number, because the mean of its divisors is an integer number (2175711576).

Almost surely, 2^21716965365 is an apocalyptic number.

It is an amenable number.

21716965365 is a deficient number, since it is larger than the sum of its proper divisors (13094419851).

21716965365 is a wasteful number, since it uses less digits than its factorization.

21716965365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2676700.

The product of its digits is 2041200, while the sum is 51.

The spelling of 21716965365 in words is "twenty-one billion, seven hundred sixteen million, nine hundred sixty-five thousand, three hundred sixty-five".