21122102220 has 48 divisors (see below), whose sum is σ = 59199312480. Its totient is φ = 5627091456.

The previous prime is 21122102213. The next prime is 21122102263. The reversal of 21122102220 is 2220122112.

It is a super-2 number, since 2×21122102220² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21122102220.

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, 108415 + ... + 232374.

It is an arithmetic number, because the mean of its divisors is an integer number (1233319010).

Almost surely, 2^21122102220 is an apocalyptic number.

21122102220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21122102220 is an abundant number, since it is smaller than the sum of its proper divisors (38077210260).

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

21122102220 is a wasteful number, since it uses less digits than its factorization.

21122102220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341834 (or 341832 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21122102220 its reverse (2220122112), we get a palindrome (23342224332).

The spelling of 21122102220 in words is "twenty-one billion, one hundred twenty-two million, one hundred two thousand, two hundred twenty".