21302313 has 8 divisors (see below), whose sum is σ = 28459488. Its totient is φ = 14173344.

The previous prime is 21302299. The next prime is 21302321. The reversal of 21302313 is 31320312.

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

It is not a de Polignac number, because 21302313 - 2⁹ = 21301801 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21302292 and 21302301.

It is not an unprimeable number, because it can be changed into a prime (21102313) 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, 5220 + ... + 8357.

It is an arithmetic number, because the mean of its divisors is an integer number (3557436).

Almost surely, 2^21302313 is an apocalyptic number.

It is an amenable number.

21302313 is a deficient number, since it is larger than the sum of its proper divisors (7157175).

21302313 is a wasteful number, since it uses less digits than its factorization.

21302313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14103.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 21302313 is about 4615.4428823245. The cubic root of 21302313 is about 277.2100176703.

Adding to 21302313 its reverse (31320312), we get a palindrome (52622625).

The spelling of 21302313 in words is "twenty-one million, three hundred two thousand, three hundred thirteen".