21433152 has 112 divisors (see below), whose sum is σ = 63268352. Its totient is φ = 6359040.

The previous prime is 21433151. The next prime is 21433163. The reversal of 21433152 is 25133412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433151) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77238 + ... + 77514.

It is an arithmetic number, because the mean of its divisors is an integer number (564896).

Almost surely, 2^21433152 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 21433152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31634176).

21433152 is an abundant number, since it is smaller than the sum of its proper divisors (41835200).

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

21433152 is a wasteful number, since it uses less digits than its factorization.

21433152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336 (or 326 counting only the distinct ones).

The product of its digits is 720, while the sum is 21.

The square root of 21433152 is about 4629.5952306870. The cubic root of 21433152 is about 277.7764018184.

Adding to 21433152 its reverse (25133412), we get a palindrome (46566564).

The spelling of 21433152 in words is "twenty-one million, four hundred thirty-three thousand, one hundred fifty-two".