21310315 has 8 divisors (see below), whose sum is σ = 27539568. Its totient is φ = 15736800.

The previous prime is 21310309. The next prime is 21310319. The reversal of 21310315 is 51301312.

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

It is not a de Polignac number, because 21310315 - 2¹³ = 21302123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21310319) 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, 163861 + ... + 163990.

It is an arithmetic number, because the mean of its divisors is an integer number (3442446).

Almost surely, 2^21310315 is an apocalyptic number.

21310315 is a deficient number, since it is larger than the sum of its proper divisors (6229253).

21310315 is a wasteful number, since it uses less digits than its factorization.

21310315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327869.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 21310315 is about 4616.3096733213. The cubic root of 21310315 is about 277.2447237116.

Adding to 21310315 its reverse (51301312), we get a palindrome (72611627).

The spelling of 21310315 in words is "twenty-one million, three hundred ten thousand, three hundred fifteen".