21223133 has 8 divisors (see below), whose sum is σ = 22444800. Its totient is φ = 20011968.

The previous prime is 21223093. The next prime is 21223141. The reversal of 21223133 is 33132212.

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 21223133 - 2¹⁶ = 21157597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223193) 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, 1733 + ... + 6741.

It is an arithmetic number, because the mean of its divisors is an integer number (2805600).

Almost surely, 2^21223133 is an apocalyptic number.

It is an amenable number.

21223133 is a deficient number, since it is larger than the sum of its proper divisors (1221667).

21223133 is a wasteful number, since it uses less digits than its factorization.

21223133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5251.

The product of its digits is 216, while the sum is 17.

The square root of 21223133 is about 4606.8571716518. The cubic root of 21223133 is about 276.8661310593.

Adding to 21223133 its reverse (33132212), we get a palindrome (54355345).

The spelling of 21223133 in words is "twenty-one million, two hundred twenty-three thousand, one hundred thirty-three".