21288295 has 16 divisors (see below), whose sum is σ = 29793600. Its totient is φ = 14596512.

The previous prime is 21288259. The next prime is 21288343. The reversal of 21288295 is 59288212.

It is not a de Polignac number, because 21288295 - 2⁷ = 21288167 is a prime.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent 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, 4492 + ... + 7921.

It is an arithmetic number, because the mean of its divisors is an integer number (1862100).

Almost surely, 2^21288295 is an apocalyptic number.

21288295 is a deficient number, since it is larger than the sum of its proper divisors (8505305).

21288295 is an equidigital number, since it uses as much as digits as its factorization.

21288295 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12439 (or 12425 counting only the distinct ones).

The product of its digits is 23040, while the sum is 37.

The square root of 21288295 is about 4613.9240349187. The cubic root of 21288295 is about 277.1491982541.

The spelling of 21288295 in words is "twenty-one million, two hundred eighty-eight thousand, two hundred ninety-five".