2311222121 has 16 divisors (see below), whose sum is σ = 2526891024. Its totient is φ = 2101054464.

The previous prime is 2311222099. The next prime is 2311222139. The reversal of 2311222121 is 1212221132.

It can be written as a sum of positive squares in 8 ways, for example, as 60668521 + 2250553600 = 7789^2 + 47440^2 .

It is not a de Polignac number, because 2311222121 - 2²⁶ = 2244113257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2311222121.

It is not an unprimeable number, because it can be changed into a prime (2311222021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 830885 + ... + 833661.

It is an arithmetic number, because the mean of its divisors is an integer number (157930689).

Almost surely, 2^2311222121 is an apocalyptic number.

It is an amenable number.

2311222121 is a deficient number, since it is larger than the sum of its proper divisors (215668903).

2311222121 is a wasteful number, since it uses less digits than its factorization.

2311222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3740.

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

The square root of 2311222121 is about 48075.1715649565. The cubic root of 2311222121 is about 1322.1494900999.

Adding to 2311222121 its reverse (1212221132), we get a palindrome (3523443253).

The spelling of 2311222121 in words is "two billion, three hundred eleven million, two hundred twenty-two thousand, one hundred twenty-one".