21230315 has 16 divisors (see below), whose sum is σ = 26976000. Its totient is φ = 15995232.

The previous prime is 21230309. The next prime is 21230329. The reversal of 21230315 is 51303212.

It is a cyclic number.

It is not a de Polignac number, because 21230315 - 2⁴ = 21230299 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21230293 and 21230302.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18344 + ... + 19466.

It is an arithmetic number, because the mean of its divisors is an integer number (1686000).

Almost surely, 2^21230315 is an apocalyptic number.

21230315 is a deficient number, since it is larger than the sum of its proper divisors (5745685).

21230315 is a wasteful number, since it uses less digits than its factorization.

21230315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1346.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 21230315 is about 4607.6365959134. The cubic root of 21230315 is about 276.8973584358.

Adding to 21230315 its reverse (51303212), we get a palindrome (72533527).

The spelling of 21230315 in words is "twenty-one million, two hundred thirty thousand, three hundred fifteen".