2311311221 has 8 divisors (see below), whose sum is σ = 2460297600. Its totient is φ = 2165058720.

The previous prime is 2311311199. The next prime is 2311311241. The reversal of 2311311221 is 1221131132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2311311221 - 2²⁶ = 2244202357 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2311311221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2311311241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 681725 + ... + 685106.

It is an arithmetic number, because the mean of its divisors is an integer number (307537200).

Almost surely, 2^2311311221 is an apocalyptic number.

It is an amenable number.

2311311221 is a deficient number, since it is larger than the sum of its proper divisors (148986379).

2311311221 is a wasteful number, since it uses less digits than its factorization.

2311311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1366939.

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

The square root of 2311311221 is about 48076.0982297857. The cubic root of 2311311221 is about 1322.1664799577.

Adding to 2311311221 its reverse (1221131132), we get a palindrome (3532442353).

The spelling of 2311311221 in words is "two billion, three hundred eleven million, three hundred eleven thousand, two hundred twenty-one".