13197666921 has 8 divisors (see below), whose sum is σ = 18164530944. Its totient is φ = 8514623760.

The previous prime is 13197666883. The next prime is 13197666953. The reversal of 13197666921 is 12966679131.

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

It is not a de Polignac number, because 13197666921 - 2²³ = 13189278313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13197666991) 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, 70955106 + ... + 70955291.

It is an arithmetic number, because the mean of its divisors is an integer number (2270566368).

Almost surely, 2^13197666921 is an apocalyptic number.

It is an amenable number.

13197666921 is a deficient number, since it is larger than the sum of its proper divisors (4966864023).

13197666921 is a wasteful number, since it uses less digits than its factorization.

13197666921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141910431.

The product of its digits is 734832, while the sum is 51.

The spelling of 13197666921 in words is "thirteen billion, one hundred ninety-seven million, six hundred sixty-six thousand, nine hundred twenty-one".