21377033880 has 64 divisors (see below), whose sum is σ = 64350084960. Its totient is φ = 5681077248.

The previous prime is 21377033863. The next prime is 21377033891. The reversal of 21377033880 is 8833077312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 268837 + ... + 339156.

Almost surely, 2^21377033880 is an apocalyptic number.

21377033880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21377033880 is an abundant number, since it is smaller than the sum of its proper divisors (42973051080).

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

21377033880 is a wasteful number, since it uses less digits than its factorization.

21377033880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608300 (or 608296 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 42.

The spelling of 21377033880 in words is "twenty-one billion, three hundred seventy-seven million, thirty-three thousand, eight hundred eighty".