21704544652 has 24 divisors (see below), whose sum is σ = 44020488960. Its totient is φ = 9170933520.

The previous prime is 21704544629. The next prime is 21704544661. The reversal of 21704544652 is 25644540712.

It is a happy number.

It is a super-2 number, since 2×21704544652² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5456902 + ... + 5460877.

It is an arithmetic number, because the mean of its divisors is an integer number (1834187040).

Almost surely, 2^21704544652 is an apocalyptic number.

It is an amenable number.

21704544652 is an abundant number, since it is smaller than the sum of its proper divisors (22315944308).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21704544652 is a wasteful number, since it uses less digits than its factorization.

21704544652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10917861 (or 10917859 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 40.

The spelling of 21704544652 in words is "twenty-one billion, seven hundred four million, five hundred forty-four thousand, six hundred fifty-two".