21730625311556 has 48 divisors (see below), whose sum is σ = 44978556779520. Its totient is φ = 8989532703360.

The previous prime is 21730625311547. The next prime is 21730625311561. The reversal of 21730625311556 is 65511352603712.

It is a super-2 number, since 2×21730625311556² (a number of 27 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 21730625311556.

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, 31841375 + ... + 32516678.

It is an arithmetic number, because the mean of its divisors is an integer number (937053266240).

Almost surely, 2^{21730625311556} is an apocalyptic number.

It is an amenable number.

21730625311556 is an abundant number, since it is smaller than the sum of its proper divisors (23247931467964).

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

21730625311556 is a wasteful number, since it uses less digits than its factorization.

21730625311556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64358484 (or 64358482 counting only the distinct ones).

The product of its (nonzero) digits is 1134000, while the sum is 47.

The spelling of 21730625311556 in words is "twenty-one trillion, seven hundred thirty billion, six hundred twenty-five million, three hundred eleven thousand, five hundred fifty-six".