21433056 has 96 divisors (see below), whose sum is σ = 62270208. Its totient is φ = 6420480.

The previous prime is 21433051. The next prime is 21433057. The reversal of 21433056 is 65033412.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433051) 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, 37251 + ... + 37821.

It is an arithmetic number, because the mean of its divisors is an integer number (648648).

Almost surely, 2^21433056 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 21433056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31135104).

21433056 is an abundant number, since it is smaller than the sum of its proper divisors (40837152).

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

21433056 is a wasteful number, since it uses less digits than its factorization.

21433056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624 (or 616 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 21433056 is about 4629.5848625984. The cubic root of 21433056 is about 277.7759870936.

Adding to 21433056 its reverse (65033412), we get a palindrome (86466468).

The spelling of 21433056 in words is "twenty-one million, four hundred thirty-three thousand, fifty-six".