21382591680 has 112 divisors (see below), whose sum is σ = 75433062240. Its totient is φ = 5702022144.

The previous prime is 21382591661. The next prime is 21382591691. The reversal of 21382591680 is 8619528312.

21382591680 is a `hidden beast` number, since 21 + 38 + 2 + 591 + 6 + 8 + 0 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 1228779 + ... + 1246058.

Almost surely, 2^21382591680 is an apocalyptic number.

21382591680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21382591680 is an abundant number, since it is smaller than the sum of its proper divisors (54050470560).

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

21382591680 is a wasteful number, since it uses less digits than its factorization.

21382591680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2474863 (or 2474847 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 21382591680 in words is "twenty-one billion, three hundred eighty-two million, five hundred ninety-one thousand, six hundred eighty".