21133323 has 12 divisors (see below), whose sum is σ = 30591288. Its totient is φ = 14058720.

The previous prime is 21133309. The next prime is 21133381. The reversal of 21133323 is 32333112.

It is not a de Polignac number, because 21133323 - 2⁵ = 21133291 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21133296 and 21133305.

It is not an unprimeable number, because it can be changed into a prime (21133303) 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, 2436 + ... + 6942.

It is an arithmetic number, because the mean of its divisors is an integer number (2549274).

Almost surely, 2^21133323 is an apocalyptic number.

21133323 is a deficient number, since it is larger than the sum of its proper divisors (9457965).

21133323 is a wasteful number, since it uses less digits than its factorization.

21133323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5034 (or 5031 counting only the distinct ones).

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

The square root of 21133323 is about 4597.0994115855. The cubic root of 21133323 is about 276.4750404479.

Adding to 21133323 its reverse (32333112), we get a palindrome (53466435).

The spelling of 21133323 in words is "twenty-one million, one hundred thirty-three thousand, three hundred twenty-three".