21637202190 has 32 divisors (see below), whose sum is σ = 52640650656. Its totient is φ = 5690880000.

The previous prime is 21637202179. The next prime is 21637202203. The reversal of 21637202190 is 9120273612.

It is a super-2 number, since 2×21637202190² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 4937811 + ... + 4942190.

It is an arithmetic number, because the mean of its divisors is an integer number (1645020333).

Almost surely, 2^21637202190 is an apocalyptic number.

21637202190 is an abundant number, since it is smaller than the sum of its proper divisors (31003448466).

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

21637202190 is a wasteful number, since it uses less digits than its factorization.

21637202190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9880084.

The product of its (nonzero) digits is 9072, while the sum is 33.

The spelling of 21637202190 in words is "twenty-one billion, six hundred thirty-seven million, two hundred two thousand, one hundred ninety".