21232943 has 2 divisors, whose sum is σ = 21232944. Its totient is φ = 21232942.

The previous prime is 21232921. The next prime is 21232963. The reversal of 21232943 is 34923212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21232943 - 2⁶ = 21232879 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21232963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10616471 + 10616472.

It is an arithmetic number, because the mean of its divisors is an integer number (10616472).

Almost surely, 2^21232943 is an apocalyptic number.

21232943 is a deficient number, since it is larger than the sum of its proper divisors (1).

21232943 is an equidigital number, since it uses as much as digits as its factorization.

21232943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

The square root of 21232943 is about 4607.9217658289. The cubic root of 21232943 is about 276.9087832346.

The spelling of 21232943 in words is "twenty-one million, two hundred thirty-two thousand, nine hundred forty-three".