21020200220 has 24 divisors (see below), whose sum is σ = 44890599600. Its totient is φ = 8265569792.

The previous prime is 21020200219. The next prime is 21020200231. The reversal of 21020200220 is 2200202012.

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, 8905685 + ... + 8908044.

It is an arithmetic number, because the mean of its divisors is an integer number (1870441650).

Almost surely, 2^21020200220 is an apocalyptic number.

21020200220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020200220 is an abundant number, since it is smaller than the sum of its proper divisors (23870399380).

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

21020200220 is a wasteful number, since it uses less digits than its factorization.

21020200220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17813797 (or 17813795 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 21020200220 its reverse (2200202012), we get a palindrome (23220402232).

The spelling of 21020200220 in words is "twenty-one billion, twenty million, two hundred thousand, two hundred twenty".