21233843 has 2 divisors, whose sum is σ = 21233844. Its totient is φ = 21233842.

The previous prime is 21233827. The next prime is 21233851. The reversal of 21233843 is 34833212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21233843 - 2⁴ = 21233827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21233813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616921 + 10616922.

It is an arithmetic number, because the mean of its divisors is an integer number (10616922).

Almost surely, 2^21233843 is an apocalyptic number.

21233843 is a deficient number, since it is larger than the sum of its proper divisors (1).

21233843 is an equidigital number, since it uses as much as digits as its factorization.

21233843 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 21233843 is about 4608.0194227021. The cubic root of 21233843 is about 276.9126956202.

The spelling of 21233843 in words is "twenty-one million, two hundred thirty-three thousand, eight hundred forty-three".