21433452 has 12 divisors (see below), whose sum is σ = 50011416. Its totient is φ = 7144480.

The previous prime is 21433441. The next prime is 21433453. The reversal of 21433452 is 25433412.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21433453) 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, 893049 + ... + 893072.

It is an arithmetic number, because the mean of its divisors is an integer number (4167618).

Almost surely, 2^21433452 is an apocalyptic number.

It is an amenable number.

21433452 is an abundant number, since it is smaller than the sum of its proper divisors (28577964).

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

21433452 is a wasteful number, since it uses less digits than its factorization.

21433452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786128 (or 1786126 counting only the distinct ones).

The product of its digits is 2880, while the sum is 24.

The square root of 21433452 is about 4629.6276308144. The cubic root of 21433452 is about 277.7776978252. Note that the first 3 decimals are identical.

Adding to 21433452 its reverse (25433412), we get a palindrome (46866864).

The spelling of 21433452 in words is "twenty-one million, four hundred thirty-three thousand, four hundred fifty-two".