21442513023531 has 24 divisors (see below), whose sum is σ = 31993104823680. Its totient is φ = 13824588384000.

The previous prime is 21442513023527. The next prime is 21442513023587. The reversal of 21442513023531 is 13532031524412.

21442513023531 is a `hidden beast` number, since 2 + 1 + 4 + 42 + 51 + 30 + 2 + 3 + 531 = 666.

It is not a de Polignac number, because 21442513023531 - 2² = 21442513023527 is a prime.

It is a super-2 number, since 2×21442513023531² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21442513023511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25392120 + ... + 26222981.

It is an arithmetic number, because the mean of its divisors is an integer number (1333046034320).

Almost surely, 2^{21442513023531} is an apocalyptic number.

21442513023531 is a deficient number, since it is larger than the sum of its proper divisors (10550591800149).

21442513023531 is a wasteful number, since it uses less digits than its factorization.

21442513023531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51616627 (or 51616624 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

Adding to 21442513023531 its reverse (13532031524412), we get a palindrome (34974544547943).

The spelling of 21442513023531 in words is "twenty-one trillion, four hundred forty-two billion, five hundred thirteen million, twenty-three thousand, five hundred thirty-one".