12420690197 has 2 divisors, whose sum is σ = 12420690198. Its totient is φ = 12420690196.

The previous prime is 12420690187. The next prime is 12420690221. The reversal of 12420690197 is 79109602421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6591978481 + 5828711716 = 81191^2 + 76346^2 .

It is a cyclic number.

It is not a de Polignac number, because 12420690197 - 2⁶ = 12420690133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12420690157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6210345098 + 6210345099.

It is an arithmetic number, because the mean of its divisors is an integer number (6210345099).

Almost surely, 2^12420690197 is an apocalyptic number.

It is an amenable number.

12420690197 is a deficient number, since it is larger than the sum of its proper divisors (1).

12420690197 is an equidigital number, since it uses as much as digits as its factorization.

12420690197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The spelling of 12420690197 in words is "twelve billion, four hundred twenty million, six hundred ninety thousand, one hundred ninety-seven".