21132233 has 2 divisors, whose sum is σ = 21132234. Its totient is φ = 21132232.

The previous prime is 21132229. The next prime is 21132257. The reversal of 21132233 is 33223112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12588304 + 8543929 = 3548^2 + 2923^2 .

It is a cyclic number.

It is not a de Polignac number, because 21132233 - 2² = 21132229 is a prime.

It is not a weakly prime, because it can be changed into another prime (21132733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566116 + 10566117.

It is an arithmetic number, because the mean of its divisors is an integer number (10566117).

Almost surely, 2^21132233 is an apocalyptic number.

It is an amenable number.

21132233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21132233 is an equidigital number, since it uses as much as digits as its factorization.

21132233 is an evil number, because the sum of its binary digits is even.

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

The square root of 21132233 is about 4596.9808570408. The cubic root of 21132233 is about 276.4702870864.

Adding to 21132233 its reverse (33223112), we get a palindrome (54355345).

The spelling of 21132233 in words is "twenty-one million, one hundred thirty-two thousand, two hundred thirty-three".