2111313221 has 4 divisors (see below), whose sum is σ = 2203109472. Its totient is φ = 2019516972.

The previous prime is 2111313209. The next prime is 2111313223. The reversal of 2111313221 is 1223131112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2111313221 - 2¹⁸ = 2111051077 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 2111313221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111313223) 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, 45898091 + ... + 45898136.

It is an arithmetic number, because the mean of its divisors is an integer number (550777368).

Almost surely, 2^2111313221 is an apocalyptic number.

It is an amenable number.

2111313221 is a deficient number, since it is larger than the sum of its proper divisors (91796251).

2111313221 is an equidigital number, since it uses as much as digits as its factorization.

2111313221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91796250.

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

The square root of 2111313221 is about 45949.0285098608. The cubic root of 2111313221 is about 1282.8746470212.

Adding to 2111313221 its reverse (1223131112), we get a palindrome (3334444333).

The spelling of 2111313221 in words is "two billion, one hundred eleven million, three hundred thirteen thousand, two hundred twenty-one".