21955200880 has 20 divisors (see below), whose sum is σ = 51045842232. Its totient is φ = 8782080320.

The previous prime is 21955200871. The next prime is 21955200887. The reversal of 21955200880 is 8800255912.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21955200887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137219926 + ... + 137220085.

Almost surely, 2^21955200880 is an apocalyptic number.

21955200880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21955200880 is an abundant number, since it is smaller than the sum of its proper divisors (29090641352).

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

21955200880 is a wasteful number, since it uses less digits than its factorization.

21955200880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274440024 (or 274440018 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 40.

The spelling of 21955200880 in words is "twenty-one billion, nine hundred fifty-five million, two hundred thousand, eight hundred eighty".