21072177800 has 48 divisors (see below), whose sum is σ = 49043111040. Its totient is φ = 8420217920.

The previous prime is 21072177793. The next prime is 21072177851. The reversal of 21072177800 is 877127012.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143009 + ... + 250191.

It is an arithmetic number, because the mean of its divisors is an integer number (1021731480).

Almost surely, 2^21072177800 is an apocalyptic number.

21072177800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21072177800 is an abundant number, since it is smaller than the sum of its proper divisors (27970933240).

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

21072177800 is a wasteful number, since it uses less digits than its factorization.

21072177800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108182 (or 108173 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 35.

The spelling of 21072177800 in words is "twenty-one billion, seventy-two million, one hundred seventy-seven thousand, eight hundred".