13311023221 has 4 divisors (see below), whose sum is σ = 13329333472. Its totient is φ = 13292712972.

The previous prime is 13311023213. The next prime is 13311023227. The reversal of 13311023221 is 12232011331.

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 13311023221 - 2³ = 13311023213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13311023227) 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, 9154035 + ... + 9155488.

It is an arithmetic number, because the mean of its divisors is an integer number (3332333368).

Almost surely, 2^13311023221 is an apocalyptic number.

It is an amenable number.

13311023221 is a deficient number, since it is larger than the sum of its proper divisors (18310251).

13311023221 is an equidigital number, since it uses as much as digits as its factorization.

13311023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18310250.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 13311023221 its reverse (12232011331), we get a palindrome (25543034552).

The spelling of 13311023221 in words is "thirteen billion, three hundred eleven million, twenty-three thousand, two hundred twenty-one".