122222220 has 24 divisors (see below), whose sum is σ = 342222384. Its totient is φ = 32592576.

The previous prime is 122222209. The next prime is 122222239. The reversal of 122222220 is 22222221.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 122222220.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1018459 + ... + 1018578.

It is an arithmetic number, because the mean of its divisors is an integer number (14259266).

Almost surely, 2^122222220 is an apocalyptic number.

122222220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

122222220 is an abundant number, since it is smaller than the sum of its proper divisors (220000164).

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

122222220 is a wasteful number, since it uses less digits than its factorization.

122222220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2037049 (or 2037047 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 122222220 is about 11055.4158673476. The cubic root of 122222220 is about 496.2685146436.

Adding to 122222220 its reverse (22222221), we get a palindrome (144444441).

Subtracting from 122222220 its reverse (22222221), we obtain a palindrome (99999999).

The spelling of 122222220 in words is "one hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty".