122222222220 has 48 divisors (see below), whose sum is σ = 391111112448. Its totient is φ = 27936507840.

The previous prime is 122222222197. The next prime is 122222222237. The reversal of 122222222220 is 22222222221.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145502226 + ... + 145503065.

It is an arithmetic number, because the mean of its divisors is an integer number (8148148176).

Almost surely, 2^122222222220 is an apocalyptic number.

122222222220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122222222220 is an abundant number, since it is smaller than the sum of its proper divisors (268888890228).

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

122222222220 is a wasteful number, since it uses less digits than its factorization.

122222222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291005310 (or 291005308 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 21.

Adding to 122222222220 its reverse (22222222221), we get a palindrome (144444444441).

Subtracting from 122222222220 its reverse (22222222221), we obtain a palindrome (99999999999).

The spelling of 122222222220 in words is "one hundred twenty-two billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty".