21173701700 has 36 divisors (see below), whose sum is σ = 46725707280. Its totient is φ = 8325927840.

The previous prime is 21173701697. The next prime is 21173701723. The reversal of 21173701700 is 710737112.

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, 1788482 + ... + 1800281.

Almost surely, 2^21173701700 is an apocalyptic number.

21173701700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21173701700 is an abundant number, since it is smaller than the sum of its proper divisors (25552005580).

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

21173701700 is a wasteful number, since it uses less digits than its factorization.

21173701700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3588836 (or 3588829 counting only the distinct ones).

The product of its (nonzero) digits is 2058, while the sum is 29.

The spelling of 21173701700 in words is "twenty-one billion, one hundred seventy-three million, seven hundred one thousand, seven hundred".