21233233 has 8 divisors (see below), whose sum is σ = 25049600. Its totient is φ = 17612640.

The previous prime is 21233213. The next prime is 21233239. The reversal of 21233233 is 33233212.

It is a happy number.

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 21233233 - 2¹³ = 21225041 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21233233.

It is not an unprimeable number, because it can be changed into a prime (21233239) 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, 48708 + ... + 49141.

It is an arithmetic number, because the mean of its divisors is an integer number (3131200).

Almost surely, 2^21233233 is an apocalyptic number.

It is an amenable number.

21233233 is a deficient number, since it is larger than the sum of its proper divisors (3816367).

21233233 is an equidigital number, since it uses as much as digits as its factorization.

21233233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97887.

The product of its digits is 648, while the sum is 19.

The square root of 21233233 is about 4607.9532332696. The cubic root of 21233233 is about 276.9100439043.

Adding to 21233233 its reverse (33233212), we get a palindrome (54466445).

It can be divided in two parts, 2123 and 3233, that added together give a triangular number (5356 = T₁₀₃).

The spelling of 21233233 in words is "twenty-one million, two hundred thirty-three thousand, two hundred thirty-three".