42121195079 has 2 divisors, whose sum is σ = 42121195080. Its totient is φ = 42121195078.

The previous prime is 42121195073. The next prime is 42121195169. The reversal of 42121195079 is 97059112124.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42121195079 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42121195073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21060597539 + 21060597540.

It is an arithmetic number, because the mean of its divisors is an integer number (21060597540).

Almost surely, 2^42121195079 is an apocalyptic number.

42121195079 is a deficient number, since it is larger than the sum of its proper divisors (1).

42121195079 is an equidigital number, since it uses as much as digits as its factorization.

42121195079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 41.

The spelling of 42121195079 in words is "forty-two billion, one hundred twenty-one million, one hundred ninety-five thousand, seventy-nine".