21220565707676 has 12 divisors (see below), whose sum is σ = 37199254030008. Its totient is φ = 10592207413392.

The previous prime is 21220565707673. The next prime is 21220565707687. The reversal of 21220565707676 is 67670756502212.

It is a super-2 number, since 2×21220565707676² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220565707673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4518857471 + ... + 4518862166.

It is an arithmetic number, because the mean of its divisors is an integer number (3099937835834).

Almost surely, 2^{21220565707676} is an apocalyptic number.

It is an amenable number.

21220565707676 is a deficient number, since it is larger than the sum of its proper divisors (15978688322332).

21220565707676 is a wasteful number, since it uses less digits than its factorization.

21220565707676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9037720228 (or 9037720226 counting only the distinct ones).

The product of its (nonzero) digits is 14817600, while the sum is 56.

The spelling of 21220565707676 in words is "twenty-one trillion, two hundred twenty billion, five hundred sixty-five million, seven hundred seven thousand, six hundred seventy-six".