21725165424344 has 64 divisors (see below), whose sum is σ = 43385965200000. Its totient is φ = 10169240387328.

The previous prime is 21725165424317. The next prime is 21725165424397. The reversal of 21725165424344 is 44342456152712.

It is a super-2 number, since 2×21725165424344² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21725165424292 and 21725165424301.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22511459 + ... + 23456685.

It is an arithmetic number, because the mean of its divisors is an integer number (677905706250).

Almost surely, 2^{21725165424344} is an apocalyptic number.

It is an amenable number.

21725165424344 is a deficient number, since it is larger than the sum of its proper divisors (21660799775656).

21725165424344 is a wasteful number, since it uses less digits than its factorization.

21725165424344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947040 (or 947036 counting only the distinct ones).

The product of its digits is 6451200, while the sum is 50.

The spelling of 21725165424344 in words is "twenty-one trillion, seven hundred twenty-five billion, one hundred sixty-five million, four hundred twenty-four thousand, three hundred forty-four".