2122522121 has 4 divisors (see below), whose sum is σ = 2131631892. Its totient is φ = 2113412352.

The previous prime is 2122522117. The next prime is 2122522139. The reversal of 2122522121 is 1212252212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 286828096 + 1835694025 = 16936^2 + 42845^2 .

It is a cyclic number.

It is not a de Polignac number, because 2122522121 - 2² = 2122522117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2122522093 and 2122522102.

It is not an unprimeable number, because it can be changed into a prime (2122522141) 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, 4554536 + ... + 4555001.

It is an arithmetic number, because the mean of its divisors is an integer number (532907973).

Almost surely, 2^2122522121 is an apocalyptic number.

It is an amenable number.

2122522121 is a deficient number, since it is larger than the sum of its proper divisors (9109771).

2122522121 is an equidigital number, since it uses as much as digits as its factorization.

2122522121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9109770.

The product of its digits is 320, while the sum is 20.

The square root of 2122522121 is about 46070.8380757286. The cubic root of 2122522121 is about 1285.1408892340.

Adding to 2122522121 its reverse (1212252212), we get a palindrome (3334774333).

The spelling of 2122522121 in words is "two billion, one hundred twenty-two million, five hundred twenty-two thousand, one hundred twenty-one".