21231333 has 12 divisors (see below), whose sum is σ = 30764448. Its totient is φ = 14109480.

The previous prime is 21231313. The next prime is 21231359. The reversal of 21231333 is 33313212.

It is not a de Polignac number, because 21231333 - 2⁶ = 21231269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231313) 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, 585 + ... + 6542.

It is an arithmetic number, because the mean of its divisors is an integer number (2563704).

Almost surely, 2^21231333 is an apocalyptic number.

It is an amenable number.

21231333 is a deficient number, since it is larger than the sum of its proper divisors (9533115).

21231333 is a wasteful number, since it uses less digits than its factorization.

21231333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7464 (or 7461 counting only the distinct ones).

The product of its digits is 324, while the sum is 18.

The square root of 21231333 is about 4607.7470633706. The cubic root of 21231333 is about 276.9017841356.

Adding to 21231333 its reverse (33313212), we get a palindrome (54544545).

The spelling of 21231333 in words is "twenty-one million, two hundred thirty-one thousand, three hundred thirty-three".