2311320221 has 16 divisors (see below), whose sum is σ = 2844305280. Its totient is φ = 1832985600.

The previous prime is 2311320211. The next prime is 2311320241. The reversal of 2311320221 is 1220231132.

It is a cyclic number.

It is not a de Polignac number, because 2311320221 - 2²² = 2307125917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 2311320221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2311320211) 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 15 ways as a sum of consecutive naturals, for example, 157580 + ... + 171621.

It is an arithmetic number, because the mean of its divisors is an integer number (177769080).

Almost surely, 2^2311320221 is an apocalyptic number.

It is an amenable number.

2311320221 is a deficient number, since it is larger than the sum of its proper divisors (532985059).

2311320221 is a wasteful number, since it uses less digits than its factorization.

2311320221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329284.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2311320221 is about 48076.1918313004. The cubic root of 2311320221 is about 1322.1681960807.

Adding to 2311320221 its reverse (1220231132), we get a palindrome (3531551353).

It can be divided in two parts, 23113 and 20221, that added together give a palindrome (43334).

The spelling of 2311320221 in words is "two billion, three hundred eleven million, three hundred twenty thousand, two hundred twenty-one".