21079795 has 16 divisors (see below), whose sum is σ = 27687168. Its totient is φ = 15279840.

The previous prime is 21079789. The next prime is 21079801. The reversal of 21079795 is 59797012.

It is an interprime number because it is at equal distance from previous prime (21079789) and next prime (21079801).

It is not a de Polignac number, because 21079795 - 2¹¹ = 21077747 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26392 + ... + 27178.

It is an arithmetic number, because the mean of its divisors is an integer number (1730448).

Almost surely, 2^21079795 is an apocalyptic number.

21079795 is a deficient number, since it is larger than the sum of its proper divisors (6607373).

21079795 is a wasteful number, since it uses less digits than its factorization.

21079795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290.

The product of its (nonzero) digits is 39690, while the sum is 40.

The square root of 21079795 is about 4591.2737883947. The cubic root of 21079795 is about 276.2414178043.

The spelling of 21079795 in words is "twenty-one million, seventy-nine thousand, seven hundred ninety-five".