21100802832 has 80 divisors (see below), whose sum is σ = 64129913280. Its totient is φ = 6619857408.

The previous prime is 21100802791. The next prime is 21100802857. The reversal of 21100802832 is 23820800112.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21100802796 and 21100802805.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1429258 + ... + 1443945.

It is an arithmetic number, because the mean of its divisors is an integer number (801623916).

Almost surely, 2^21100802832 is an apocalyptic number.

It is an amenable number.

21100802832 is an abundant number, since it is smaller than the sum of its proper divisors (43029110448).

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

21100802832 is a wasteful number, since it uses less digits than its factorization.

21100802832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2873237 (or 2873225 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The spelling of 21100802832 in words is "twenty-one billion, one hundred million, eight hundred two thousand, eight hundred thirty-two".