21902089220 has 24 divisors (see below), whose sum is σ = 50175695808. Its totient is φ = 7964396000.

The previous prime is 21902089211. The next prime is 21902089243. The reversal of 21902089220 is 2298020912.

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, 49777256 + ... + 49777695.

It is an arithmetic number, because the mean of its divisors is an integer number (2090653992).

Almost surely, 2^21902089220 is an apocalyptic number.

21902089220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21902089220 is an abundant number, since it is smaller than the sum of its proper divisors (28273606588).

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

21902089220 is a wasteful number, since it uses less digits than its factorization.

21902089220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99554971 (or 99554969 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

It can be divided in two parts, 219020892 and 20, that added together give a palindrome (219020912).

The spelling of 21902089220 in words is "twenty-one billion, nine hundred two million, eighty-nine thousand, two hundred twenty".