21433332 has 48 divisors (see below), whose sum is σ = 52899840. Its totient is φ = 6740448.

The previous prime is 21433319. The next prime is 21433351. The reversal of 21433332 is 23333412.

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

It is a junction number, because it is equal to n+sod(n) for n = 21433299 and 21433308.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21313 + ... + 22295.

It is an arithmetic number, because the mean of its divisors is an integer number (1102080).

Almost surely, 2^21433332 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21433332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26449920).

21433332 is an abundant number, since it is smaller than the sum of its proper divisors (31466508).

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

21433332 is a wasteful number, since it uses less digits than its factorization.

21433332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092 (or 1090 counting only the distinct ones).

The product of its digits is 1296, while the sum is 21.

The square root of 21433332 is about 4629.6146707906. The cubic root of 21433332 is about 277.7771794239. Note that the first 3 decimals are identical.

Adding to 21433332 its reverse (23333412), we get a palindrome (44766744).

The spelling of 21433332 in words is "twenty-one million, four hundred thirty-three thousand, three hundred thirty-two".