21433104 has 120 divisors (see below), whose sum is σ = 74822592. Its totient is φ = 5564160.

The previous prime is 21433103. The next prime is 21433123. The reversal of 21433104 is 40133412.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21433103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10122 + ... + 12054.

Almost surely, 2^21433104 is an apocalyptic number.

21433104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21433104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37411296).

21433104 is an abundant number, since it is smaller than the sum of its proper divisors (53389488).

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

21433104 is a wasteful number, since it uses less digits than its factorization.

21433104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1965 (or 1956 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21433104 is about 4629.5900466456. The cubic root of 21433104 is about 277.7761944562.

Adding to 21433104 its reverse (40133412), we get a palindrome (61566516).

The spelling of 21433104 in words is "twenty-one million, four hundred thirty-three thousand, one hundred four".