21241233 has 12 divisors (see below), whose sum is σ = 33042100. Its totient is φ = 13071456.

The previous prime is 21241229. The next prime is 21241247. The reversal of 21241233 is 33214212.

It can be written as a sum of positive squares in 2 ways, for example, as 2862864 + 18378369 = 1692^2 + 4287^2 .

It is not a de Polignac number, because 21241233 - 2² = 21241229 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21241223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 90658 + ... + 90891.

Almost surely, 2^21241233 is an apocalyptic number.

It is an amenable number.

21241233 is a deficient number, since it is larger than the sum of its proper divisors (11800867).

21241233 is a wasteful number, since it uses less digits than its factorization.

21241233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181568 (or 181565 counting only the distinct ones).

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

The square root of 21241233 is about 4608.8212158859. The cubic root of 21241233 is about 276.9448164735.

Adding to 21241233 its reverse (33214212), we get a palindrome (54455445).

The spelling of 21241233 in words is "twenty-one million, two hundred forty-one thousand, two hundred thirty-three".