21451364365365 has 32 divisors (see below), whose sum is σ = 41602646044800. Its totient is φ = 10400661509760.

The previous prime is 21451364365177. The next prime is 21451364365381. The reversal of 21451364365365 is 56356346315412.

21451364365365 is a `hidden beast` number, since 2 + 1 + 4 + 5 + 13 + 64 + 36 + 536 + 5 = 666.

It is not a de Polignac number, because 21451364365365 - 2¹² = 21451364361269 is a prime.

It is a super-2 number, since 2×21451364365365² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7222680120 + ... + 7222683089.

It is an arithmetic number, because the mean of its divisors is an integer number (1300082688900).

Almost surely, 2^{21451364365365} is an apocalyptic number.

It is an amenable number.

21451364365365 is a deficient number, since it is larger than the sum of its proper divisors (20151281679435).

21451364365365 is a wasteful number, since it uses less digits than its factorization.

21451364365365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14445363234 (or 14445363228 counting only the distinct ones).

The product of its digits is 23328000, while the sum is 54.

The spelling of 21451364365365 in words is "twenty-one trillion, four hundred fifty-one billion, three hundred sixty-four million, three hundred sixty-five thousand, three hundred sixty-five".