21693890880 has 112 divisors (see below), whose sum is σ = 76531256640. Its totient is φ = 5785035264.

The previous prime is 21693890863. The next prime is 21693890891. The reversal of 21693890880 is 8809839612.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1246794 + ... + 1264073.

Almost surely, 2^21693890880 is an apocalyptic number.

21693890880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21693890880 is an abundant number, since it is smaller than the sum of its proper divisors (54837365760).

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

21693890880 is a wasteful number, since it uses less digits than its factorization.

21693890880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2510893 (or 2510877 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The spelling of 21693890880 in words is "twenty-one billion, six hundred ninety-three million, eight hundred ninety thousand, eight hundred eighty".