21377613680 has 40 divisors (see below), whose sum is σ = 49754319984. Its totient is φ = 8542208000.

The previous prime is 21377613667. The next prime is 21377613743. The reversal of 21377613680 is 8631677312.

It is a tau number, because it is divible by the number of its divisors (40).

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, 59921 + ... + 215280.

Almost surely, 2^21377613680 is an apocalyptic number.

21377613680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21377613680 is an abundant number, since it is smaller than the sum of its proper divisors (28376706304).

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

21377613680 is a wasteful number, since it uses less digits than its factorization.

21377613680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276185 (or 276179 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 44.

The spelling of 21377613680 in words is "twenty-one billion, three hundred seventy-seven million, six hundred thirteen thousand, six hundred eighty".