79421005123 has 2 divisors, whose sum is σ = 79421005124. Its totient is φ = 79421005122.

The previous prime is 79421005109. The next prime is 79421005219. The reversal of 79421005123 is 32150012497.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79421005123 - 2⁵ = 79421005091 is a prime.

It is not a weakly prime, because it can be changed into another prime (79421005523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39710502561 + 39710502562.

It is an arithmetic number, because the mean of its divisors is an integer number (39710502562).

Almost surely, 2^79421005123 is an apocalyptic number.

79421005123 is a deficient number, since it is larger than the sum of its proper divisors (1).

79421005123 is an equidigital number, since it uses as much as digits as its factorization.

79421005123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 34.

The spelling of 79421005123 in words is "seventy-nine billion, four hundred twenty-one million, five thousand, one hundred twenty-three".