21122200220 has 48 divisors (see below), whose sum is σ = 48972083328. Its totient is φ = 7588253760.

The previous prime is 21122200219. The next prime is 21122200223. The reversal of 21122200220 is 2200222112.

It is a super-2 number, since 2×21122200220² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21122200195 and 21122200204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122200223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 560114 + ... + 596633.

It is an arithmetic number, because the mean of its divisors is an integer number (1020251736).

Almost surely, 2^21122200220 is an apocalyptic number.

21122200220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122200220 is an abundant number, since it is smaller than the sum of its proper divisors (27849883108).

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

21122200220 is a wasteful number, since it uses less digits than its factorization.

21122200220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156850 (or 1156848 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21122200220 its reverse (2200222112), we get a palindrome (23322422332).

The spelling of 21122200220 in words is "twenty-one billion, one hundred twenty-two million, two hundred thousand, two hundred twenty".