13372121721 has 8 divisors (see below), whose sum is σ = 20376566464. Its totient is φ = 7641212400.

The previous prime is 13372121713. The next prime is 13372121723. The reversal of 13372121721 is 12712127331.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13372121721 - 2³ = 13372121713 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13372121723) 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, 318383830 + ... + 318383871.

It is an arithmetic number, because the mean of its divisors is an integer number (2547070808).

Almost surely, 2^13372121721 is an apocalyptic number.

It is an amenable number.

13372121721 is a deficient number, since it is larger than the sum of its proper divisors (7004444743).

13372121721 is an equidigital number, since it uses as much as digits as its factorization.

13372121721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636767711.

The product of its digits is 3528, while the sum is 30.

The spelling of 13372121721 in words is "thirteen billion, three hundred seventy-two million, one hundred twenty-one thousand, seven hundred twenty-one".