21195315 has 12 divisors (see below), whose sum is σ = 36738624. Its totient is φ = 11304144.

The previous prime is 21195313. The next prime is 21195323. The reversal of 21195315 is 51359112.

It is not a de Polignac number, because 21195315 - 2¹ = 21195313 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21195313) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235459 + ... + 235548.

It is an arithmetic number, because the mean of its divisors is an integer number (3061552).

Almost surely, 2^21195315 is an apocalyptic number.

21195315 is a deficient number, since it is larger than the sum of its proper divisors (15543309).

21195315 is a wasteful number, since it uses less digits than its factorization.

21195315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471018 (or 471015 counting only the distinct ones).

The product of its digits is 1350, while the sum is 27.

The square root of 21195315 is about 4603.8369866884. The cubic root of 21195315 is about 276.7451117053.

The spelling of 21195315 in words is "twenty-one million, one hundred ninety-five thousand, three hundred fifteen".