21995115 has 16 divisors (see below), whose sum is σ = 35251200. Its totient is φ = 11711072.

The previous prime is 21995087. The next prime is 21995123. The reversal of 21995115 is 51159912.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21995115 - 2⁹ = 21994603 is a prime.

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, 14566 + ... + 16004.

It is an arithmetic number, because the mean of its divisors is an integer number (2203200).

Almost surely, 2^21995115 is an apocalyptic number.

21995115 is a deficient number, since it is larger than the sum of its proper divisors (13256085).

21995115 is a wasteful number, since it uses less digits than its factorization.

21995115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2466.

The product of its digits is 4050, while the sum is 33.

The square root of 21995115 is about 4689.8949881634. The cubic root of 21995115 is about 280.1831921938.

The spelling of 21995115 in words is "twenty-one million, nine hundred ninety-five thousand, one hundred fifteen".