21433266 has 12 divisors (see below), whose sum is σ = 46438782. Its totient is φ = 7144416.

The previous prime is 21433259. The next prime is 21433289. The reversal of 21433266 is 66233412.

It can be written as a sum of positive squares in only one way, i.e., 21427641 + 5625 = 4629^2 + 75^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 595351 + ... + 595386.

Almost surely, 2^21433266 is an apocalyptic number.

21433266 is an abundant number, since it is smaller than the sum of its proper divisors (25005516).

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

21433266 is a wasteful number, since it uses less digits than its factorization.

21433266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1190745 (or 1190742 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 21433266 is about 4629.6075427621. The cubic root of 21433266 is about 277.7768943024.

Adding to 21433266 its reverse (66233412), we get a palindrome (87666678).

The spelling of 21433266 in words is "twenty-one million, four hundred thirty-three thousand, two hundred sixty-six".