1222011121 has 4 divisors (see below), whose sum is σ = 1222105572. Its totient is φ = 1221916672.

The previous prime is 1222011113. The next prime is 1222011169. The reversal of 1222011121 is 1211102221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1211102221 = 7 ⋅173014603.

It can be written as a sum of positive squares in 2 ways, for example, as 995087025 + 226924096 = 31545^2 + 15064^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222011121 - 2³ = 1222011113 is a prime.

It is a super-2 number, since 2×1222011121² = 2986622359695353282, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1222011521) 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, 24016 + ... + 54961.

It is an arithmetic number, because the mean of its divisors is an integer number (305526393).

Almost surely, 2^1222011121 is an apocalyptic number.

It is an amenable number.

1222011121 is a deficient number, since it is larger than the sum of its proper divisors (94451).

1222011121 is an equidigital number, since it uses as much as digits as its factorization.

1222011121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94450.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 1222011121 is about 34957.2756518582. The cubic root of 1222011121 is about 1069.1165505982.

Adding to 1222011121 its reverse (1211102221), we get a palindrome (2433113342).

The spelling of 1222011121 in words is "one billion, two hundred twenty-two million, eleven thousand, one hundred twenty-one".