21222102220 has 24 divisors (see below), whose sum is σ = 48617907408. Its totient is φ = 7717128000.

The previous prime is 21222102211. The next prime is 21222102221. The reversal of 21222102220 is 2220122212.

It is a super-2 number, since 2×21222102220² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21222102194 and 21222102203.

It is not an unprimeable number, because it can be changed into a prime (21222102221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48231831 + ... + 48232270.

It is an arithmetic number, because the mean of its divisors is an integer number (2025746142).

Almost surely, 2^21222102220 is an apocalyptic number.

21222102220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222102220 is an abundant number, since it is smaller than the sum of its proper divisors (27395805188).

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

21222102220 is a wasteful number, since it uses less digits than its factorization.

21222102220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96464121 (or 96464119 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21222102220 its reverse (2220122212), we get a palindrome (23442224432).

The spelling of 21222102220 in words is "twenty-one billion, two hundred twenty-two million, one hundred two thousand, two hundred twenty".