122220121 has 4 divisors (see below), whose sum is σ = 122332032. Its totient is φ = 122108212.

The previous prime is 122220113. The next prime is 122220143. The reversal of 122220121 is 121022221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 122220121 - 2³ = 122220113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122220151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54301 + ... + 56506.

It is an arithmetic number, because the mean of its divisors is an integer number (30583008).

Almost surely, 2^122220121 is an apocalyptic number.

It is an amenable number.

122220121 is a deficient number, since it is larger than the sum of its proper divisors (111911).

122220121 is a wasteful number, since it uses less digits than its factorization.

122220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111910.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 122220121 is about 11055.3209360923. The cubic root of 122220121 is about 496.2656737156.

Adding to 122220121 its reverse (121022221), we get a palindrome (243242342).

The spelling of 122220121 in words is "one hundred twenty-two million, two hundred twenty thousand, one hundred twenty-one".