21133024 has 24 divisors (see below), whose sum is σ = 45388728. Its totient is φ = 9605760.

The previous prime is 21133009. The next prime is 21133027. The reversal of 21133024 is 42033112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 21132989 and 21133007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133027) 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, 29667 + ... + 30370.

It is an arithmetic number, because the mean of its divisors is an integer number (1891197).

Almost surely, 2^21133024 is an apocalyptic number.

It is an amenable number.

21133024 is an abundant number, since it is smaller than the sum of its proper divisors (24255704).

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

21133024 is a wasteful number, since it uses less digits than its factorization.

21133024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60058 (or 60050 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21133024 is about 4597.0668909643. The cubic root of 21133024 is about 276.4737365604.

Adding to 21133024 its reverse (42033112), we get a palindrome (63166136).

The spelling of 21133024 in words is "twenty-one million, one hundred thirty-three thousand, twenty-four".