122222121 has 12 divisors (see below), whose sum is σ = 189569232. Its totient is φ = 69841128.

The previous prime is 122222071. The next prime is 122222131. The reversal of 122222121 is 121222221.

It is not a de Polignac number, because 122222121 - 2¹⁴ = 122205737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 122222121.

It is not an unprimeable number, because it can be changed into a prime (122222131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 415575 + ... + 415868.

It is an arithmetic number, because the mean of its divisors is an integer number (15797436).

Almost surely, 2^122222121 is an apocalyptic number.

It is an amenable number.

122222121 is a deficient number, since it is larger than the sum of its proper divisors (67347111).

122222121 is an equidigital number, since it uses as much as digits as its factorization.

122222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831460 (or 831453 counting only the distinct ones).

The product of its digits is 64, while the sum is 15.

The square root of 122222121 is about 11055.4113899031. The cubic root of 122222121 is about 496.2683806511.

Adding to 122222121 its reverse (121222221), we get a palindrome (243444342).

The spelling of 122222121 in words is "one hundred twenty-two million, two hundred twenty-two thousand, one hundred twenty-one".