21680515422 has 12 divisors (see below), whose sum is σ = 46974450120. Its totient is φ = 7226838468.

The previous prime is 21680515397. The next prime is 21680515427. The reversal of 21680515422 is 22451508612.

21680515422 is a `hidden beast` number, since 2 + 1 + 68 + 0 + 51 + 542 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21680515427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 602236522 + ... + 602236557.

It is an arithmetic number, because the mean of its divisors is an integer number (3914537510).

Almost surely, 2^21680515422 is an apocalyptic number.

21680515422 is an abundant number, since it is smaller than the sum of its proper divisors (25293934698).

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

21680515422 is a wasteful number, since it uses less digits than its factorization.

21680515422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1204473087 (or 1204473084 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The spelling of 21680515422 in words is "twenty-one billion, six hundred eighty million, five hundred fifteen thousand, four hundred twenty-two".