21235079 has 2 divisors, whose sum is σ = 21235080. Its totient is φ = 21235078.

The previous prime is 21235063. The next prime is 21235099. The reversal of 21235079 is 97053212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21235079 - 2⁴ = 21235063 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21235009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617539 + 10617540.

It is an arithmetic number, because the mean of its divisors is an integer number (10617540).

Almost surely, 2^21235079 is an apocalyptic number.

21235079 is a deficient number, since it is larger than the sum of its proper divisors (1).

21235079 is an equidigital number, since it uses as much as digits as its factorization.

21235079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 21235079 is about 4608.1535347686. The cubic root of 21235079 is about 276.9180684497.

The spelling of 21235079 in words is "twenty-one million, two hundred thirty-five thousand, seventy-nine".