21022233 has 4 divisors (see below), whose sum is σ = 28029648. Its totient is φ = 14014820.

The previous prime is 21022223. The next prime is 21022249. The reversal of 21022233 is 33222012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21022233 - 2¹³ = 21014041 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21022213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3503703 + ... + 3503708.

It is an arithmetic number, because the mean of its divisors is an integer number (7007412).

Almost surely, 2^21022233 is an apocalyptic number.

It is an amenable number.

21022233 is a deficient number, since it is larger than the sum of its proper divisors (7007415).

21022233 is an equidigital number, since it uses as much as digits as its factorization.

21022233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7007414.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 21022233 is about 4585.0008724099. Note that the first 3 decimals coincide. The cubic root of 21022233 is about 275.9897470461.

Adding to 21022233 its reverse (33222012), we get a palindrome (54244245).

The spelling of 21022233 in words is "twenty-one million, twenty-two thousand, two hundred thirty-three".