21775441760 has 48 divisors (see below), whose sum is σ = 52064325936. Its totient is φ = 8605229568.

The previous prime is 21775441759. The next prime is 21775441813. The reversal of 21775441760 is 6714457712.

It is a congruent number.

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, 806579 + ... + 833138.

It is an arithmetic number, because the mean of its divisors is an integer number (1084673457).

Almost surely, 2^21775441760 is an apocalyptic number.

21775441760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21775441760 is an abundant number, since it is smaller than the sum of its proper divisors (30288884176).

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

21775441760 is a wasteful number, since it uses less digits than its factorization.

21775441760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639815 (or 1639807 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 44.

The spelling of 21775441760 in words is "twenty-one billion, seven hundred seventy-five million, four hundred forty-one thousand, seven hundred sixty".