21795867 has 12 divisors (see below), whose sum is σ = 31732480. Its totient is φ = 14415408.

The previous prime is 21795857. The next prime is 21795899. The reversal of 21795867 is 76859712.

It is not a de Polignac number, because 21795867 - 2⁸ = 21795611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21795817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8392 + ... + 10677.

Almost surely, 2^21795867 is an apocalyptic number.

21795867 is a deficient number, since it is larger than the sum of its proper divisors (9936613).

21795867 is a wasteful number, since it uses less digits than its factorization.

21795867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19202 (or 19199 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 21795867 is about 4668.6043953199. The cubic root of 21795867 is about 279.3345891432.

The spelling of 21795867 in words is "twenty-one million, seven hundred ninety-five thousand, eight hundred sixty-seven".