21288795 has 16 divisors (see below), whose sum is σ = 37158912. Its totient is φ = 10321760.

The previous prime is 21288779. The next prime is 21288829. The reversal of 21288795 is 59788212.

It is not a de Polignac number, because 21288795 - 2⁴ = 21288779 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, 64347 + ... + 64676.

It is an arithmetic number, because the mean of its divisors is an integer number (2322432).

Almost surely, 2^21288795 is an apocalyptic number.

21288795 is a deficient number, since it is larger than the sum of its proper divisors (15870117).

21288795 is a wasteful number, since it uses less digits than its factorization.

21288795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129042.

The product of its digits is 80640, while the sum is 42.

The square root of 21288795 is about 4613.9782184141. The cubic root of 21288795 is about 277.1513680461.

The spelling of 21288795 in words is "twenty-one million, two hundred eighty-eight thousand, seven hundred ninety-five".