2313120221 has 4 divisors (see below), whose sum is σ = 2313240732. Its totient is φ = 2312999712.

The previous prime is 2313120217. The next prime is 2313120223. The reversal of 2313120221 is 1220213132.

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.

It can be written as a sum of positive squares in 2 ways, for example, as 2000325625 + 312794596 = 44725^2 + 17686^2 .

It is a cyclic number.

It is not a de Polignac number, because 2313120221 - 2² = 2313120217 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 2313120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2313120223) 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, 24320 + ... + 72233.

It is an arithmetic number, because the mean of its divisors is an integer number (578310183).

Almost surely, 2^2313120221 is an apocalyptic number.

It is an amenable number.

2313120221 is a deficient number, since it is larger than the sum of its proper divisors (120511).

2313120221 is an equidigital number, since it uses as much as digits as its factorization.

2313120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120510.

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

The square root of 2313120221 is about 48094.9084727271. The cubic root of 2313120221 is about 1322.5113311708.

Adding to 2313120221 its reverse (1220213132), we get a palindrome (3533333353).

The spelling of 2313120221 in words is "two billion, three hundred thirteen million, one hundred twenty thousand, two hundred twenty-one".