21233104 has 40 divisors (see below), whose sum is σ = 43256160. Its totient is φ = 10082688.

The previous prime is 21233087. The next prime is 21233111. The reversal of 21233104 is 40133212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30747 + ... + 31429.

It is an arithmetic number, because the mean of its divisors is an integer number (1081404).

Almost surely, 2^21233104 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 21233104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21628080).

21233104 is an abundant number, since it is smaller than the sum of its proper divisors (22023056).

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

21233104 is a wasteful number, since it uses less digits than its factorization.

21233104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21233104 is about 4607.9392357105. The cubic root of 21233104 is about 276.9094831250.

Adding to 21233104 its reverse (40133212), we get a palindrome (61366316).

The spelling of 21233104 in words is "twenty-one million, two hundred thirty-three thousand, one hundred four".