12121010197 has 2 divisors, whose sum is σ = 12121010198. Its totient is φ = 12121010196.

The previous prime is 12121010179. The next prime is 12121010203. The reversal of 12121010197 is 79101012121.

Together with previous prime (12121010179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9042868836 + 3078141361 = 95094^2 + 55481^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121010197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12121010107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060505098 + 6060505099.

It is an arithmetic number, because the mean of its divisors is an integer number (6060505099).

Almost surely, 2^12121010197 is an apocalyptic number.

It is an amenable number.

12121010197 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121010197 is an equidigital number, since it uses as much as digits as its factorization.

12121010197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 25.

The spelling of 12121010197 in words is "twelve billion, one hundred twenty-one million, ten thousand, one hundred ninety-seven".