21755576752 has 40 divisors (see below), whose sum is σ = 51878686496. Its totient is φ = 8606601216.

The previous prime is 21755576749. The next prime is 21755576761. The reversal of 21755576752 is 25767555712.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a self number, because there is not a number n which added to its sum of digits gives 21755576752.

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, 7469553 + ... + 7472464.

Almost surely, 2^21755576752 is an apocalyptic number.

It is an amenable number.

21755576752 is an abundant number, since it is smaller than the sum of its proper divisors (30123109744).

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

21755576752 is a wasteful number, since it uses less digits than its factorization.

21755576752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14942045 (or 14942039 counting only the distinct ones).

The product of its digits is 5145000, while the sum is 52.

The spelling of 21755576752 in words is "twenty-one billion, seven hundred fifty-five million, five hundred seventy-six thousand, seven hundred fifty-two".