1222311121 has 4 divisors (see below), whose sum is σ = 1261740544. Its totient is φ = 1182881700.

The previous prime is 1222311109. The next prime is 1222311127. The reversal of 1222311121 is 1211132221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1211132221 = 13 ⋅93164017.

It is a cyclic number.

It is not a de Polignac number, because 1222311121 - 2¹⁹ = 1221786833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1222311095 and 1222311104.

It is not an unprimeable number, because it can be changed into a prime (1222311127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19714665 + ... + 19714726.

It is an arithmetic number, because the mean of its divisors is an integer number (315435136).

Almost surely, 2^1222311121 is an apocalyptic number.

It is an amenable number.

1222311121 is a deficient number, since it is larger than the sum of its proper divisors (39429423).

1222311121 is an equidigital number, since it uses as much as digits as its factorization.

1222311121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39429422.

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

The square root of 1222311121 is about 34961.5663407691. The cubic root of 1222311121 is about 1069.2040317230.

Adding to 1222311121 its reverse (1211132221), we get a palindrome (2433443342).

The spelling of 1222311121 in words is "one billion, two hundred twenty-two million, three hundred eleven thousand, one hundred twenty-one".