21313307 has 8 divisors (see below), whose sum is σ = 22608960. Its totient is φ = 20035080.

The previous prime is 21313301. The next prime is 21313333. The reversal of 21313307 is 70331312.

It is a happy number.

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-21313307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21313301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1793 + ... + 6770.

It is an arithmetic number, because the mean of its divisors is an integer number (2826120).

Almost surely, 2^21313307 is an apocalyptic number.

21313307 is a deficient number, since it is larger than the sum of its proper divisors (1295653).

21313307 is a wasteful number, since it uses less digits than its factorization.

21313307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8713.

The product of its (nonzero) digits is 378, while the sum is 20.

The square root of 21313307 is about 4616.6337303278. The cubic root of 21313307 is about 277.2576982953.

Adding to 21313307 its reverse (70331312), we get a palindrome (91644619).

The spelling of 21313307 in words is "twenty-one million, three hundred thirteen thousand, three hundred seven".