21359079 has 16 divisors (see below), whose sum is σ = 36163840. Its totient is φ = 12205080.

The previous prime is 21359071. The next prime is 21359083. The reversal of 21359079 is 97095312.

It is not a de Polignac number, because 21359079 - 2³ = 21359071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21359071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56317 + ... + 56694.

It is an arithmetic number, because the mean of its divisors is an integer number (2260240).

Almost surely, 2^21359079 is an apocalyptic number.

21359079 is a deficient number, since it is larger than the sum of its proper divisors (14804761).

21359079 is a wasteful number, since it uses less digits than its factorization.

21359079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113027 (or 113021 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 36.

The square root of 21359079 is about 4621.5883633227. The cubic root of 21359079 is about 277.4560339403.

The spelling of 21359079 in words is "twenty-one million, three hundred fifty-nine thousand, seventy-nine".