21877525560 has 128 divisors (see below), whose sum is σ = 72773199360. Its totient is φ = 5216678400.

The previous prime is 21877525559. The next prime is 21877525577. The reversal of 21877525560 is 6552577812.

It is a super-2 number, since 2×21877525560² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55332 + ... + 216371.

It is an arithmetic number, because the mean of its divisors is an integer number (568540620).

Almost surely, 2^21877525560 is an apocalyptic number.

21877525560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21877525560 is an abundant number, since it is smaller than the sum of its proper divisors (50895673800).

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

21877525560 is a wasteful number, since it uses less digits than its factorization.

21877525560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271789 (or 271785 counting only the distinct ones).

The product of its (nonzero) digits is 1176000, while the sum is 48.

The spelling of 21877525560 in words is "twenty-one billion, eight hundred seventy-seven million, five hundred twenty-five thousand, five hundred sixty".