12173972121 has 12 divisors (see below), whose sum is σ = 17593758000. Its totient is φ = 8111766840.

The previous prime is 12173972081. The next prime is 12173972137. The reversal of 12173972121 is 12127937121.

It is not a de Polignac number, because 12173972121 - 2¹⁴ = 12173955737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12173972141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 332871 + ... + 367628.

It is an arithmetic number, because the mean of its divisors is an integer number (1466146500).

Almost surely, 2^12173972121 is an apocalyptic number.

It is an amenable number.

12173972121 is a deficient number, since it is larger than the sum of its proper divisors (5419785879).

12173972121 is a wasteful number, since it uses less digits than its factorization.

12173972121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702436 (or 702433 counting only the distinct ones).

The product of its digits is 10584, while the sum is 36.

The spelling of 12173972121 in words is "twelve billion, one hundred seventy-three million, nine hundred seventy-two thousand, one hundred twenty-one".