21363315 has 16 divisors (see below), whose sum is σ = 35980800. Its totient is φ = 10793952.

The previous prime is 21363311. The next prime is 21363317. The reversal of 21363315 is 51336312.

It is a happy number.

It is not a de Polignac number, because 21363315 - 2² = 21363311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21363311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37195 + ... + 37764.

It is an arithmetic number, because the mean of its divisors is an integer number (2248800).

Almost surely, 2^21363315 is an apocalyptic number.

21363315 is a deficient number, since it is larger than the sum of its proper divisors (14617485).

21363315 is a wasteful number, since it uses less digits than its factorization.

21363315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74986.

The product of its digits is 1620, while the sum is 24.

The square root of 21363315 is about 4622.0466246026. The cubic root of 21363315 is about 277.4743747135.

Adding to 21363315 its reverse (51336312), we get a palindrome (72699627).

The spelling of 21363315 in words is "twenty-one million, three hundred sixty-three thousand, three hundred fifteen".