21315246553623 has 32 divisors (see below), whose sum is σ = 31184229553920. Its totient is φ = 12843238403840.

The previous prime is 21315246553597. The next prime is 21315246553669. The reversal of 21315246553623 is 32635564251312.

It is a cyclic number.

It is not a de Polignac number, because 21315246553623 - 2³⁸ = 21040368646679 is a prime.

It is a super-2 number, since 2×21315246553623² (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 (21315246553423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 345586315 + ... + 345647987.

It is an arithmetic number, because the mean of its divisors is an integer number (974507173560).

Almost surely, 2^{21315246553623} is an apocalyptic number.

21315246553623 is a deficient number, since it is larger than the sum of its proper divisors (9868983000297).

21315246553623 is a wasteful number, since it uses less digits than its factorization.

21315246553623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122399.

The product of its digits is 3888000, while the sum is 48.

The spelling of 21315246553623 in words is "twenty-one trillion, three hundred fifteen billion, two hundred forty-six million, five hundred fifty-three thousand, six hundred twenty-three".