21288296 has 16 divisors (see below), whose sum is σ = 40270500. Its totient is φ = 10549504.

The previous prime is 21288259. The next prime is 21288343. The reversal of 21288296 is 69288212.

It can be written as a sum of positive squares in 2 ways, for example, as 12348196 + 8940100 = 3514^2 + 2990^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10871 + ... + 12678.

Almost surely, 2^21288296 is an apocalyptic number.

It is an amenable number.

21288296 is a deficient number, since it is larger than the sum of its proper divisors (18982204).

21288296 is a wasteful number, since it uses less digits than its factorization.

21288296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23668 (or 23664 counting only the distinct ones).

The product of its digits is 27648, while the sum is 38.

The square root of 21288296 is about 4613.9241432863. The cubic root of 21288296 is about 277.1492025937.

The spelling of 21288296 in words is "twenty-one million, two hundred eighty-eight thousand, two hundred ninety-six".