21642873080 has 32 divisors (see below), whose sum is σ = 48707179200. Its totient is φ = 8655244416.

The previous prime is 21642873079. The next prime is 21642873113. The reversal of 21642873080 is 8037824612.

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 7 ways as a sum of consecutive naturals, for example, 132161 + ... + 246479.

It is an arithmetic number, because the mean of its divisors is an integer number (1522099350).

Almost surely, 2^21642873080 is an apocalyptic number.

21642873080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21642873080 is an abundant number, since it is smaller than the sum of its proper divisors (27064306120).

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

21642873080 is a wasteful number, since it uses less digits than its factorization.

21642873080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119063 (or 119059 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The spelling of 21642873080 in words is "twenty-one billion, six hundred forty-two million, eight hundred seventy-three thousand, eighty".