21716626365 has 256 divisors, whose sum is σ = 48522240000. Its totient is φ = 8991295488.

The previous prime is 21716626343. The next prime is 21716626417. The reversal of 21716626365 is 56362661712.

21716626365 is a `hidden beast` number, since 2 + 1 + 7 + 1 + 6 + 6 + 2 + 636 + 5 = 666.

It is not a de Polignac number, because 21716626365 - 2¹⁰ = 21716625341 is a prime.

It is a super-2 number, since 2×21716626365² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21716626365.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 93204289 + ... + 93204521.

It is an arithmetic number, because the mean of its divisors is an integer number (189540000).

Almost surely, 2^21716626365 is an apocalyptic number.

It is an amenable number.

21716626365 is an abundant number, since it is smaller than the sum of its proper divisors (26805613635).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21716626365 is a wasteful number, since it uses less digits than its factorization.

21716626365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481 (or 475 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The spelling of 21716626365 in words is "twenty-one billion, seven hundred sixteen million, six hundred twenty-six thousand, three hundred sixty-five".