12173259921 has 16 divisors (see below), whose sum is σ = 17236799424. Its totient is φ = 7615448064.

The previous prime is 12173259883. The next prime is 12173259937. The reversal of 12173259921 is 12995237121.

It is not a de Polignac number, because 12173259921 - 2¹⁰ = 12173258897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12173259941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 336955 + ... + 371328.

It is an arithmetic number, because the mean of its divisors is an integer number (1077299964).

Almost surely, 2^12173259921 is an apocalyptic number.

It is an amenable number.

12173259921 is a deficient number, since it is larger than the sum of its proper divisors (5063539503).

12173259921 is a wasteful number, since it uses less digits than its factorization.

12173259921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708640.

The product of its digits is 68040, while the sum is 42.

The spelling of 12173259921 in words is "twelve billion, one hundred seventy-three million, two hundred fifty-nine thousand, nine hundred twenty-one".