13013015221 has 4 divisors (see below), whose sum is σ = 13025862252. Its totient is φ = 13000168192.

The previous prime is 13013015219. The next prime is 13013015269. The reversal of 13013015221 is 12251031031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12251031031 = 1277 ⋅9593603.

It can be written as a sum of positive squares in 2 ways, for example, as 6683062500 + 6329952721 = 81750^2 + 79561^2 .

It is a cyclic number.

It is not a de Polignac number, because 13013015221 - 2¹ = 13013015219 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 (13013010221) 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, 6421996 + ... + 6424021.

It is an arithmetic number, because the mean of its divisors is an integer number (3256465563).

Almost surely, 2^13013015221 is an apocalyptic number.

It is an amenable number.

13013015221 is a deficient number, since it is larger than the sum of its proper divisors (12847031).

13013015221 is a wasteful number, since it uses less digits than its factorization.

13013015221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12847030.

The product of its (nonzero) digits is 180, while the sum is 19.

Adding to 13013015221 its reverse (12251031031), we get a palindrome (25264046252).

The spelling of 13013015221 in words is "thirteen billion, thirteen million, fifteen thousand, two hundred twenty-one".