21113202220 has 24 divisors (see below), whose sum is σ = 48368427408. Its totient is φ = 7677528000.

The previous prime is 21113202169. The next prime is 21113202221. The reversal of 21113202220 is 2220231112.

It is a happy number.

It is a super-2 number, since 2×21113202220² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21113202194 and 21113202203.

It is not an unprimeable number, because it can be changed into a prime (21113202221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47984331 + ... + 47984770.

It is an arithmetic number, because the mean of its divisors is an integer number (2015351142).

Almost surely, 2^21113202220 is an apocalyptic number.

21113202220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113202220 is an abundant number, since it is smaller than the sum of its proper divisors (27255225188).

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

21113202220 is a wasteful number, since it uses less digits than its factorization.

21113202220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95969121 (or 95969119 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21113202220 its reverse (2220231112), we get a palindrome (23333433332).

The spelling of 21113202220 in words is "twenty-one billion, one hundred thirteen million, two hundred two thousand, two hundred twenty".