21433248 has 60 divisors (see below), whose sum is σ = 63042210. Its totient is φ = 7143552.

The previous prime is 21433231. The next prime is 21433259. The reversal of 21433248 is 84233412.

It can be written as a sum of positive squares in only one way, i.e., 13749264 + 7683984 = 3708^2 + 2772^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1543 + ... + 6726.

Almost surely, 2^21433248 is an apocalyptic number.

It is an amenable number.

21433248 is an abundant number, since it is smaller than the sum of its proper divisors (41608962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21433248 is an equidigital number, since it uses as much as digits as its factorization.

21433248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8291 (or 8274 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 21433248 is about 4629.6055987524. The cubic root of 21433248 is about 277.7768165419.

The spelling of 21433248 in words is "twenty-one million, four hundred thirty-three thousand, two hundred forty-eight".