21133432 has 16 divisors (see below), whose sum is σ = 40373640. Its totient is φ = 10367136.

The previous prime is 21133429. The next prime is 21133433. The reversal of 21133432 is 23433112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133433) 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, 24498 + ... + 25345.

Almost surely, 2^21133432 is an apocalyptic number.

It is an amenable number.

21133432 is a deficient number, since it is larger than the sum of its proper divisors (19240208).

21133432 is a wasteful number, since it uses less digits than its factorization.

21133432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49902 (or 49898 counting only the distinct ones).

The product of its digits is 432, while the sum is 19.

The square root of 21133432 is about 4597.1112668718. Note that the first 3 decimals coincide. The cubic root of 21133432 is about 276.4755157751.

Adding to 21133432 its reverse (23433112), we get a palindrome (44566544).

The spelling of 21133432 in words is "twenty-one million, one hundred thirty-three thousand, four hundred thirty-two".