13031013221 has 4 divisors (see below), whose sum is σ = 13031259072. Its totient is φ = 13030767372.

The previous prime is 13031013211. The next prime is 13031013241. The reversal of 13031013221 is 12231013031.

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 13031013221 - 2⁶ = 13031013157 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 13031013221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13031013211) 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, 6941 + ... + 161586.

It is an arithmetic number, because the mean of its divisors is an integer number (3257814768).

Almost surely, 2^13031013221 is an apocalyptic number.

It is an amenable number.

13031013221 is a deficient number, since it is larger than the sum of its proper divisors (245851).

13031013221 is an equidigital number, since it uses as much as digits as its factorization.

13031013221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245850.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 13031013221 its reverse (12231013031), we get a palindrome (25262026252).

The spelling of 13031013221 in words is "thirteen billion, thirty-one million, thirteen thousand, two hundred twenty-one".