21313259 has 8 divisors (see below), whose sum is σ = 23355120. Its totient is φ = 19288800.

The previous prime is 21313247. The next prime is 21313283. The reversal of 21313259 is 95231312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21313259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21313759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1712 + ... + 6749.

It is an arithmetic number, because the mean of its divisors is an integer number (2919390).

Almost surely, 2^21313259 is an apocalyptic number.

21313259 is a deficient number, since it is larger than the sum of its proper divisors (2041861).

21313259 is a wasteful number, since it uses less digits than its factorization.

21313259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8701.

The product of its digits is 1620, while the sum is 26.

The square root of 21313259 is about 4616.6285317318. The cubic root of 21313259 is about 277.2574901565.

The spelling of 21313259 in words is "twenty-one million, three hundred thirteen thousand, two hundred fifty-nine".