13021220110321 has 4 divisors (see below), whose sum is σ = 13023597552372. Its totient is φ = 13018842668272.

The previous prime is 13021220110273. The next prime is 13021220110391. The reversal of 13021220110321 is 12301102212031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12679930470321 + 341289640000 = 3560889^2 + 584200^2 .

It is a cyclic number.

It is not a de Polignac number, because 13021220110321 - 2²⁵ = 13021186555889 is a prime.

It is a super-2 number, since 2×13021220110321² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13021220110391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1188712810 + ... + 1188723763.

It is an arithmetic number, because the mean of its divisors is an integer number (3255899388093).

Almost surely, 2^{13021220110321} is an apocalyptic number.

It is an amenable number.

13021220110321 is a deficient number, since it is larger than the sum of its proper divisors (2377442051).

13021220110321 is an equidigital number, since it uses as much as digits as its factorization.

13021220110321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2377442050.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 13021220110321 its reverse (12301102212031), we get a palindrome (25322322322352).

The spelling of 13021220110321 in words is "thirteen trillion, twenty-one billion, two hundred twenty million, one hundred ten thousand, three hundred twenty-one".