2311221311 has 16 divisors (see below), whose sum is σ = 2666840064. Its totient is φ = 1962019584.

The previous prime is 2311221277. The next prime is 2311221359. The reversal of 2311221311 is 1131221132.

It is not a de Polignac number, because 2311221311 - 2²⁶ = 2244112447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2311221311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2311221361) 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, 596366 + ... + 600228.

It is an arithmetic number, because the mean of its divisors is an integer number (166677504).

Almost surely, 2^2311221311 is an apocalyptic number.

2311221311 is a deficient number, since it is larger than the sum of its proper divisors (355618753).

2311221311 is a wasteful number, since it uses less digits than its factorization.

2311221311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4670.

The product of its digits is 72, while the sum is 17.

The square root of 2311221311 is about 48075.1631406488. The cubic root of 2311221311 is about 1322.1493356447.

Adding to 2311221311 its reverse (1131221132), we get a palindrome (3442442443).

The spelling of 2311221311 in words is "two billion, three hundred eleven million, two hundred twenty-one thousand, three hundred eleven".