12001020197 has 4 divisors (see below), whose sum is σ = 12040111776. Its totient is φ = 11961928620.

The previous prime is 12001020191. The next prime is 12001020259. The reversal of 12001020197 is 79102010021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12001020197 - 2⁴ = 12001020181 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 (12001020191) 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, 19545329 + ... + 19545942.

It is an arithmetic number, because the mean of its divisors is an integer number (3010027944).

Almost surely, 2^12001020197 is an apocalyptic number.

It is an amenable number.

12001020197 is a deficient number, since it is larger than the sum of its proper divisors (39091579).

12001020197 is an equidigital number, since it uses as much as digits as its factorization.

12001020197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39091578.

The product of its (nonzero) digits is 252, while the sum is 23.

The spelling of 12001020197 in words is "twelve billion, one million, twenty thousand, one hundred ninety-seven".