1222131121 has 4 divisors (see below), whose sum is σ = 1240371952. Its totient is φ = 1203890292.

The previous prime is 1222131103. The next prime is 1222131181. The reversal of 1222131121 is 1211312221.

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 1222131121 - 2⁵ = 1222131089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1222131095 and 1222131104.

It is not an unprimeable number, because it can be changed into a prime (1222131181) 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, 9120315 + ... + 9120448.

It is an arithmetic number, because the mean of its divisors is an integer number (310092988).

Almost surely, 2^1222131121 is an apocalyptic number.

It is an amenable number.

1222131121 is a deficient number, since it is larger than the sum of its proper divisors (18240831).

1222131121 is an equidigital number, since it uses as much as digits as its factorization.

1222131121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18240830.

The product of its digits is 48, while the sum is 16.

The square root of 1222131121 is about 34958.9919906167. The cubic root of 1222131121 is about 1069.1515447660.

Adding to 1222131121 its reverse (1211312221), we get a palindrome (2433443342).

The spelling of 1222131121 in words is "one billion, two hundred twenty-two million, one hundred thirty-one thousand, one hundred twenty-one".