21677891569880 has 128 divisors (see below), whose sum is σ = 61495257559680. Its totient is φ = 6693361274880.

The previous prime is 21677891569787. The next prime is 21677891569897. The reversal of 21677891569880 is 8896519877612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72478379 + ... + 72776858.

It is an arithmetic number, because the mean of its divisors is an integer number (480431699685).

Almost surely, 2^{21677891569880} is an apocalyptic number.

21677891569880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21677891569880 is an abundant number, since it is smaller than the sum of its proper divisors (39817365989800).

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

21677891569880 is a wasteful number, since it uses less digits than its factorization.

21677891569880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145255309 (or 145255305 counting only the distinct ones).

The product of its (nonzero) digits is 731566080, while the sum is 77.

The spelling of 21677891569880 in words is "twenty-one trillion, six hundred seventy-seven billion, eight hundred ninety-one million, five hundred sixty-nine thousand, eight hundred eighty".