13120220321 has 4 divisors (see below), whose sum is σ = 14129468052. Its totient is φ = 12110972592.

The previous prime is 13120220279. The next prime is 13120220357. The reversal of 13120220321 is 12302202131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12302202131 = 1187 ⋅10364113.

It can be written as a sum of positive squares in 2 ways, for example, as 5031916096 + 8088304225 = 70936^2 + 89935^2 .

It is a cyclic number.

It is not a de Polignac number, because 13120220321 - 2¹⁴ = 13120203937 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 13120220321.

It is not an unprimeable number, because it can be changed into a prime (13120220371) 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, 504623846 + ... + 504623871.

It is an arithmetic number, because the mean of its divisors is an integer number (3532367013).

Almost surely, 2^13120220321 is an apocalyptic number.

It is an amenable number.

13120220321 is a deficient number, since it is larger than the sum of its proper divisors (1009247731).

13120220321 is a wasteful number, since it uses less digits than its factorization.

13120220321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009247730.

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

Adding to 13120220321 its reverse (12302202131), we get a palindrome (25422422452).

The spelling of 13120220321 in words is "thirteen billion, one hundred twenty million, two hundred twenty thousand, three hundred twenty-one".