212220022122 has 12 divisors (see below), whose sum is σ = 459810047970. Its totient is φ = 70740007368.

The previous prime is 212220022073. The next prime is 212220022127. The reversal of 212220022122 is 221220022212.

It can be written as a sum of positive squares in only one way, i.e., 206398484721 + 5821537401 = 454311^2 + 76299^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 11790001229 = 212220022122 / (2 + 1 + 2 + 2 + 2 + 0 + 0 + 2 + 2 + 1 + 2 + 2).

It is a junction number, because it is equal to n+sod(n) for n = 212220022095 and 212220022104.

It is not an unprimeable number, because it can be changed into a prime (212220022127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5895000597 + ... + 5895000632.

Almost surely, 2^212220022122 is an apocalyptic number.

212220022122 is an abundant number, since it is smaller than the sum of its proper divisors (247590025848).

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

212220022122 is a wasteful number, since it uses less digits than its factorization.

212220022122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11790001237 (or 11790001234 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 212220022122 its reverse (221220022212), we get a palindrome (433440044334).

The spelling of 212220022122 in words is "two hundred twelve billion, two hundred twenty million, twenty-two thousand, one hundred twenty-two".