21668795 has 8 divisors (see below), whose sum is σ = 27532224. Its totient is φ = 16315264.

The previous prime is 21668789. The next prime is 21668807. The reversal of 21668795 is 59786612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21668795 - 2¹⁶ = 21603259 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127379 + ... + 127548.

It is an arithmetic number, because the mean of its divisors is an integer number (3441528).

Almost surely, 2^21668795 is an apocalyptic number.

21668795 is a deficient number, since it is larger than the sum of its proper divisors (5863429).

21668795 is a wasteful number, since it uses less digits than its factorization.

21668795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254949.

The product of its digits is 181440, while the sum is 44.

The square root of 21668795 is about 4654.9752953158. The cubic root of 21668795 is about 278.7906815889.

The spelling of 21668795 in words is "twenty-one million, six hundred sixty-eight thousand, seven hundred ninety-five".