13013220221 has 8 divisors (see below), whose sum is σ = 13343211864. Its totient is φ = 12686356800.

The previous prime is 13013220217. The next prime is 13013220263. The reversal of 13013220221 is 12202231031.

It can be written as a sum of positive squares in 4 ways, for example, as 438064900 + 12575155321 = 20930^2 + 112139^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13013220221 - 2² = 13013220217 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 13013220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13013220211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 773630 + ... + 790271.

It is an arithmetic number, because the mean of its divisors is an integer number (1667901483).

Almost surely, 2^13013220221 is an apocalyptic number.

It is an amenable number.

13013220221 is a deficient number, since it is larger than the sum of its proper divisors (329991643).

13013220221 is a wasteful number, since it uses less digits than its factorization.

13013220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564111.

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

Adding to 13013220221 its reverse (12202231031), we get a palindrome (25215451252).

The spelling of 13013220221 in words is "thirteen billion, thirteen million, two hundred twenty thousand, two hundred twenty-one".