21668295 has 32 divisors (see below), whose sum is σ = 38755584. Its totient is φ = 10246400.

The previous prime is 21668279. The next prime is 21668299. The reversal of 21668295 is 59286612.

It is not a de Polignac number, because 21668295 - 2⁴ = 21668279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21668299) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5164 + ... + 8366.

It is an arithmetic number, because the mean of its divisors is an integer number (1211112).

Almost surely, 2^21668295 is an apocalyptic number.

21668295 is a deficient number, since it is larger than the sum of its proper divisors (17087289).

21668295 is a wasteful number, since it uses less digits than its factorization.

21668295 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3263.

The product of its digits is 51840, while the sum is 39.

The square root of 21668295 is about 4654.9215890281. The cubic root of 21668295 is about 278.7885372394.

The spelling of 21668295 in words is "twenty-one million, six hundred sixty-eight thousand, two hundred ninety-five".