21133248 has 28 divisors (see below), whose sum is σ = 55915560. Its totient is φ = 7044352.

The previous prime is 21133243. The next prime is 21133283. The reversal of 21133248 is 84233112.

It is a super-2 number, since 2×21133248² = 893228342059008, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133241) by changing a digit.

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, 54843 + ... + 55226.

Almost surely, 2^21133248 is an apocalyptic number.

It is an amenable number.

21133248 is an abundant number, since it is smaller than the sum of its proper divisors (34782312).

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

21133248 is a wasteful number, since it uses less digits than its factorization.

21133248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110084 (or 110074 counting only the distinct ones).

The product of its digits is 1152, while the sum is 24.

The square root of 21133248 is about 4597.0912542607. The cubic root of 21133248 is about 276.4747133870.

The spelling of 21133248 in words is "twenty-one million, one hundred thirty-three thousand, two hundred forty-eight".