1222123121 has 4 divisors (see below), whose sum is σ = 1251931044. Its totient is φ = 1192315200.

The previous prime is 1222123117. The next prime is 1222123139. The reversal of 1222123121 is 1213212221.

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 148840000 + 1073283121 = 12200^2 + 32761^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222123121 - 2² = 1222123117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1222123121.

It is not an unprimeable number, because it can be changed into a prime (1222123141) 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, 14903900 + ... + 14903981.

It is an arithmetic number, because the mean of its divisors is an integer number (312982761).

Almost surely, 2^1222123121 is an apocalyptic number.

It is an amenable number.

1222123121 is a deficient number, since it is larger than the sum of its proper divisors (29807923).

1222123121 is an equidigital number, since it uses as much as digits as its factorization.

1222123121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29807922.

The product of its digits is 96, while the sum is 17.

The square root of 1222123121 is about 34958.8775706544. The cubic root of 1222123121 is about 1069.1492118928.

Adding to 1222123121 its reverse (1213212221), we get a palindrome (2435335342).

The spelling of 1222123121 in words is "one billion, two hundred twenty-two million, one hundred twenty-three thousand, one hundred twenty-one".