21468680688680 has 32 divisors (see below), whose sum is σ = 48315155343840. Its totient is φ = 8585583600960.

The previous prime is 21468680688677. The next prime is 21468680688683. The reversal of 21468680688680 is 8688608686412.

It is an interprime number because it is at equal distance from previous prime (21468680688677) and next prime (21468680688683).

It is not an unprimeable number, because it can be changed into a prime (21468680688683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58836926 + ... + 59200685.

It is an arithmetic number, because the mean of its divisors is an integer number (1509848604495).

Almost surely, 2^{21468680688680} is an apocalyptic number.

21468680688680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21468680688680 is an abundant number, since it is smaller than the sum of its proper divisors (26846474655160).

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

21468680688680 is a wasteful number, since it uses less digits than its factorization.

21468680688680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118042169 (or 118042165 counting only the distinct ones).

The product of its (nonzero) digits is 339738624, while the sum is 71.

The spelling of 21468680688680 in words is "twenty-one trillion, four hundred sixty-eight billion, six hundred eighty million, six hundred eighty-eight thousand, six hundred eighty".