21200859860 has 24 divisors (see below), whose sum is σ = 45148876416. Its totient is φ = 8360901920.

The previous prime is 21200859859. The next prime is 21200859887. The reversal of 21200859860 is 6895800212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7463672 + ... + 7466511.

It is an arithmetic number, because the mean of its divisors is an integer number (1881203184).

Almost surely, 2^21200859860 is an apocalyptic number.

21200859860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21200859860 is an abundant number, since it is smaller than the sum of its proper divisors (23948016556).

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

21200859860 is a wasteful number, since it uses less digits than its factorization.

21200859860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14930263 (or 14930261 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 41.

The spelling of 21200859860 in words is "twenty-one billion, two hundred million, eight hundred fifty-nine thousand, eight hundred sixty".