22212021220 has 24 divisors (see below), whose sum is σ = 47525345784. Its totient is φ = 8717170176.

The previous prime is 22212021197. The next prime is 22212021229. The reversal of 22212021220 is 2212021222.

It can be written as a sum of positive squares in 4 ways, for example, as 608312896 + 21603708324 = 24664^2 + 146982^2 .

It is a junction number, because it is equal to n+sod(n) for n = 22212021194 and 22212021203.

It is not an unprimeable number, because it can be changed into a prime (22212021229) 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, 10476309 + ... + 10478428.

It is an arithmetic number, because the mean of its divisors is an integer number (1980222741).

Almost surely, 2^22212021220 is an apocalyptic number.

22212021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22212021220 is an abundant number, since it is smaller than the sum of its proper divisors (25313324564).

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

22212021220 is a wasteful number, since it uses less digits than its factorization.

22212021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20954799 (or 20954797 counting only the distinct ones).

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

Adding to 22212021220 its reverse (2212021222), we get a palindrome (24424042442).

The spelling of 22212021220 in words is "twenty-two billion, two hundred twelve million, twenty-one thousand, two hundred twenty".