21441233 has 8 divisors (see below), whose sum is σ = 24766560. Its totient is φ = 18345280.

The previous prime is 21441229. The next prime is 21441239. The reversal of 21441233 is 33214412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21441233 - 2² = 21441229 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21441239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57143 + ... + 57516.

It is an arithmetic number, because the mean of its divisors is an integer number (3095820).

Almost surely, 2^21441233 is an apocalyptic number.

It is an amenable number.

21441233 is a deficient number, since it is larger than the sum of its proper divisors (3325327).

21441233 is a wasteful number, since it uses less digits than its factorization.

21441233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114687.

The product of its digits is 576, while the sum is 20.

The square root of 21441233 is about 4630.4679029230. The cubic root of 21441233 is about 277.8113076977.

Adding to 21441233 its reverse (33214412), we get a palindrome (54655645).

The spelling of 21441233 in words is "twenty-one million, four hundred forty-one thousand, two hundred thirty-three".