13323213121221 has 8 divisors (see below), whose sum is σ = 19738093512960. Its totient is φ = 8882142080796.

The previous prime is 13323213121171. The next prime is 13323213121241. The reversal of 13323213121221 is 12212131232331.

13323213121221 is a `hidden beast` number, since 1 + 3 + 3 + 2 + 321 + 312 + 1 + 2 + 21 = 666.

It is not a de Polignac number, because 13323213121221 - 2²⁷ = 13323078903493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 493452337823 = 13323213121221 / (1 + 3 + 3 + 2 + 3 + 2 + 1 + 3 + 1 + 2 + 1 + 2 + 2 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13323213121241) 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, 246726168885 + ... + 246726168938.

It is an arithmetic number, because the mean of its divisors is an integer number (2467261689120).

Almost surely, 2^{13323213121221} is an apocalyptic number.

It is an amenable number.

13323213121221 is a deficient number, since it is larger than the sum of its proper divisors (6414880391739).

13323213121221 is an equidigital number, since it uses as much as digits as its factorization.

13323213121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493452337832 (or 493452337826 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

Adding to 13323213121221 its reverse (12212131232331), we get a palindrome (25535344353552).

The spelling of 13323213121221 in words is "thirteen trillion, three hundred twenty-three billion, two hundred thirteen million, one hundred twenty-one thousand, two hundred twenty-one".