21232123079 has 2 divisors, whose sum is σ = 21232123080. Its totient is φ = 21232123078.

The previous prime is 21232123063. The next prime is 21232123091. The reversal of 21232123079 is 97032123212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21232123079 - 2⁴ = 21232123063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21232123279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616061539 + 10616061540.

It is an arithmetic number, because the mean of its divisors is an integer number (10616061540).

Almost surely, 2^21232123079 is an apocalyptic number.

21232123079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232123079 is an equidigital number, since it uses as much as digits as its factorization.

21232123079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The spelling of 21232123079 in words is "twenty-one billion, two hundred thirty-two million, one hundred twenty-three thousand, seventy-nine".