21452315 has 16 divisors (see below), whose sum is σ = 26801280. Its totient is φ = 16464000.

The previous prime is 21452309. The next prime is 21452339. The reversal of 21452315 is 51325412.

It is not a de Polignac number, because 21452315 - 2¹⁰ = 21451291 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 28190 + ... + 28940.

It is an arithmetic number, because the mean of its divisors is an integer number (1675080).

Almost surely, 2^21452315 is an apocalyptic number.

21452315 is a deficient number, since it is larger than the sum of its proper divisors (5348965).

21452315 is a wasteful number, since it uses less digits than its factorization.

21452315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 982.

The product of its digits is 1200, while the sum is 23.

The square root of 21452315 is about 4631.6643876689. The cubic root of 21452315 is about 277.8591621386.

Adding to 21452315 its reverse (51325412), we get a palindrome (72777727).

The spelling of 21452315 in words is "twenty-one million, four hundred fifty-two thousand, three hundred fifteen".