21639224853 has 12 divisors (see below), whose sum is σ = 31466436300. Its totient is φ = 14329329216.

The previous prime is 21639224837. The next prime is 21639224869. The reversal of 21639224853 is 35842293612.

21639224853 is a `hidden beast` number, since 2 + 1 + 639 + 2 + 2 + 4 + 8 + 5 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (21639224837) and next prime (21639224869).

It can be written as a sum of positive squares in 2 ways, for example, as 7700589009 + 13938635844 = 87753^2 + 118062^2 .

It is not a de Polignac number, because 21639224853 - 2⁴ = 21639224837 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21639224799 and 21639224808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21639224813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8066976 + ... + 8069657.

It is an arithmetic number, because the mean of its divisors is an integer number (2622203025).

Almost surely, 2^21639224853 is an apocalyptic number.

It is an amenable number.

21639224853 is a deficient number, since it is larger than the sum of its proper divisors (9827211447).

21639224853 is a wasteful number, since it uses less digits than its factorization.

21639224853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16136788 (or 16136785 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The spelling of 21639224853 in words is "twenty-one billion, six hundred thirty-nine million, two hundred twenty-four thousand, eight hundred fifty-three".