21023233 has 8 divisors (see below), whose sum is σ = 26210880. Its totient is φ = 16381680.

The previous prime is 21023213. The next prime is 21023257. The reversal of 21023233 is 33232012.

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

It is not a de Polignac number, because 21023233 - 2¹³ = 21015041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21023213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136438 + ... + 136591.

It is an arithmetic number, because the mean of its divisors is an integer number (3276360).

Almost surely, 2^21023233 is an apocalyptic number.

It is an amenable number.

21023233 is a deficient number, since it is larger than the sum of its proper divisors (5187647).

21023233 is a wasteful number, since it uses less digits than its factorization.

21023233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273047.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 21023233 is about 4585.1099223465. The cubic root of 21023233 is about 275.9941231333.

Adding to 21023233 its reverse (33232012), we get a palindrome (54255245).

It can be divided in two parts, 2102 and 3233, that added together give a palindrome (5335).

The spelling of 21023233 in words is "twenty-one million, twenty-three thousand, two hundred thirty-three".