21907039680 has 140 divisors (see below), whose sum is σ = 77927286360. Its totient is φ = 5841870336.

The previous prime is 21907039673. The next prime is 21907039703. The reversal of 21907039680 is 8693070912.

21907039680 is a `hidden beast` number, since 2 + 190 + 70 + 396 + 8 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 396670 + ... + 448509.

It is an arithmetic number, because the mean of its divisors is an integer number (556623474).

Almost surely, 2^21907039680 is an apocalyptic number.

21907039680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21907039680 is an abundant number, since it is smaller than the sum of its proper divisors (56020246680).

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

21907039680 is an equidigital number, since it uses as much as digits as its factorization.

21907039680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 845208 (or 845189 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The spelling of 21907039680 in words is "twenty-one billion, nine hundred seven million, thirty-nine thousand, six hundred eighty".