21652754823 has 18 divisors (see below), whose sum is σ = 35746158344. Its totient is φ = 12372335352.

The previous prime is 21652754821. The next prime is 21652754839. The reversal of 21652754823 is 32845725612.

21652754823 is a `hidden beast` number, since 2 + 1 + 65 + 27 + 548 + 23 = 666.

It is not a de Polignac number, because 21652754823 - 2¹ = 21652754821 is a prime.

It is a super-2 number, since 2×21652754823² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21652754821) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1158688 + ... + 1177226.

Almost surely, 2^21652754823 is an apocalyptic number.

21652754823 is a deficient number, since it is larger than the sum of its proper divisors (14093403521).

21652754823 is an frugal number, since it uses more digits than its factorization.

21652754823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37091 (or 18549 counting only the distinct ones).

The product of its digits is 806400, while the sum is 45.

The spelling of 21652754823 in words is "twenty-one billion, six hundred fifty-two million, seven hundred fifty-four thousand, eight hundred twenty-three".