79121212197 has 8 divisors (see below), whose sum is σ = 105511404960. Its totient is φ = 52739247120.

The previous prime is 79121212187. The next prime is 79121212207.

79121212197 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (79121212187) and next prime (79121212207).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 79121212197 - 2⁸ = 79121211941 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79121212117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2034447 + ... + 2072972.

It is an arithmetic number, because the mean of its divisors is an integer number (13188925620).

Almost surely, 2^79121212197 is an apocalyptic number.

It is an amenable number.

79121212197 is a deficient number, since it is larger than the sum of its proper divisors (26390192763).

79121212197 is a wasteful number, since it uses less digits than its factorization.

79121212197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4113843.

The product of its digits is 31752, while the sum is 42.

The spelling of 79121212197 in words is "seventy-nine billion, one hundred twenty-one million, two hundred twelve thousand, one hundred ninety-seven".