21412288 has 28 divisors (see below), whose sum is σ = 42780712. Its totient is φ = 10632960.

The previous prime is 21412277. The next prime is 21412301. The reversal of 21412288 is 88221412.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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, 8983 + ... + 11113.

Almost surely, 2^21412288 is an apocalyptic number.

It is an amenable number.

21412288 is a deficient number, since it is larger than the sum of its proper divisors (21368424).

21412288 is a wasteful number, since it uses less digits than its factorization.

21412288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300 (or 2290 counting only the distinct ones).

The product of its digits is 2048, while the sum is 28.

The square root of 21412288 is about 4627.3413533043. The cubic root of 21412288 is about 277.6862391830.

The spelling of 21412288 in words is "twenty-one million, four hundred twelve thousand, two hundred eighty-eight".