22121222020 has 12 divisors (see below), whose sum is σ = 46454566284. Its totient is φ = 8848488800.

The previous prime is 22121221981. The next prime is 22121222027. The reversal of 22121222020 is 2022212122.

It can be written as a sum of positive squares in 2 ways, for example, as 14848884736 + 7272337284 = 121856^2 + 85278^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22121221985 and 22121222003.

It is not an unprimeable number, because it can be changed into a prime (22121222027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553030531 + ... + 553030570.

It is an arithmetic number, because the mean of its divisors is an integer number (3871213857).

Almost surely, 2^22121222020 is an apocalyptic number.

22121222020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22121222020 is an abundant number, since it is smaller than the sum of its proper divisors (24333344264).

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

22121222020 is a wasteful number, since it uses less digits than its factorization.

22121222020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1106061110 (or 1106061108 counting only the distinct ones).

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

Adding to 22121222020 its reverse (2022212122), we get a palindrome (24143434142).

The spelling of 22121222020 in words is "twenty-two billion, one hundred twenty-one million, two hundred twenty-two thousand, twenty".