13221923399 has 4 divisors (see below), whose sum is σ = 13272197136. Its totient is φ = 13171649664.

The previous prime is 13221923381. The next prime is 13221923411. The reversal of 13221923399 is 99332912231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99332912231 = 7 ⋅14190416033.

It is a cyclic number.

It is not a de Polignac number, because 13221923399 - 2¹⁶ = 13221857863 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 (13221223399) 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, 25136474 + ... + 25136999.

It is an arithmetic number, because the mean of its divisors is an integer number (3318049284).

Almost surely, 2^13221923399 is an apocalyptic number.

13221923399 is a deficient number, since it is larger than the sum of its proper divisors (50273737).

13221923399 is an equidigital number, since it uses as much as digits as its factorization.

13221923399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50273736.

The product of its digits is 157464, while the sum is 44.

The spelling of 13221923399 in words is "thirteen billion, two hundred twenty-one million, nine hundred twenty-three thousand, three hundred ninety-nine".