21834233 has 2 divisors, whose sum is σ = 21834234. Its totient is φ = 21834232.

The previous prime is 21834203. The next prime is 21834269. The reversal of 21834233 is 33243812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21409129 + 425104 = 4627^2 + 652^2 .

It is a cyclic number.

It is not a de Polignac number, because 21834233 - 2¹⁰ = 21833209 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21834203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10917116 + 10917117.

It is an arithmetic number, because the mean of its divisors is an integer number (10917117).

Almost surely, 2^21834233 is an apocalyptic number.

It is an amenable number.

21834233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21834233 is an equidigital number, since it uses as much as digits as its factorization.

21834233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 26.

The square root of 21834233 is about 4672.7115254422. The cubic root of 21834233 is about 279.4983918930.

The spelling of 21834233 in words is "twenty-one million, eight hundred thirty-four thousand, two hundred thirty-three".