13233312221 has 4 divisors (see below), whose sum is σ = 13541063712. Its totient is φ = 12925560732.

The previous prime is 13233312181. The next prime is 13233312263. The reversal of 13233312221 is 12221333231.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12221333231 = 787 ⋅15529013.

It is a cyclic number.

It is not a de Polignac number, because 13233312221 - 2²⁶ = 13166203357 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 (13233317221) 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, 153875681 + ... + 153875766.

It is an arithmetic number, because the mean of its divisors is an integer number (3385265928).

Almost surely, 2^13233312221 is an apocalyptic number.

It is an amenable number.

13233312221 is a deficient number, since it is larger than the sum of its proper divisors (307751491).

13233312221 is an equidigital number, since it uses as much as digits as its factorization.

13233312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307751490.

The product of its digits is 1296, while the sum is 23.

Adding to 13233312221 its reverse (12221333231), we get a palindrome (25454645452).

The spelling of 13233312221 in words is "thirteen billion, two hundred thirty-three million, three hundred twelve thousand, two hundred twenty-one".