21331023079 has 2 divisors, whose sum is σ = 21331023080. Its totient is φ = 21331023078.

The previous prime is 21331023067. The next prime is 21331023127. The reversal of 21331023079 is 97032013312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21331023079 - 2¹⁵ = 21330990311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21331023079.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21331023019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665511539 + 10665511540.

It is an arithmetic number, because the mean of its divisors is an integer number (10665511540).

Almost surely, 2^21331023079 is an apocalyptic number.

21331023079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331023079 is an equidigital number, since it uses as much as digits as its factorization.

21331023079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6804, while the sum is 31.

The spelling of 21331023079 in words is "twenty-one billion, three hundred thirty-one million, twenty-three thousand, seventy-nine".