13398223121 has 4 divisors (see below), whose sum is σ = 13398680100. Its totient is φ = 13397766144.

The previous prime is 13398223117. The next prime is 13398223123. The reversal of 13398223121 is 12132289331.

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 6013227025 + 7384996096 = 77545^2 + 85936^2 .

It is a cyclic number.

It is not a de Polignac number, because 13398223121 - 2² = 13398223117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13398223123) 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, 181256 + ... + 244233.

It is an arithmetic number, because the mean of its divisors is an integer number (3349670025).

Almost surely, 2^13398223121 is an apocalyptic number.

It is an amenable number.

13398223121 is a deficient number, since it is larger than the sum of its proper divisors (456979).

13398223121 is an equidigital number, since it uses as much as digits as its factorization.

13398223121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456978.

The product of its digits is 15552, while the sum is 35.

The spelling of 13398223121 in words is "thirteen billion, three hundred ninety-eight million, two hundred twenty-three thousand, one hundred twenty-one".