21732323 has 2 divisors, whose sum is σ = 21732324. Its totient is φ = 21732322.

The previous prime is 21732317. The next prime is 21732331. The reversal of 21732323 is 32323712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21732323 - 2²² = 17538019 is a prime.

It is not a weakly prime, because it can be changed into another prime (21732343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10866161 + 10866162.

It is an arithmetic number, because the mean of its divisors is an integer number (10866162).

Almost surely, 2^21732323 is an apocalyptic number.

21732323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21732323 is an equidigital number, since it uses as much as digits as its factorization.

21732323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 23.

The square root of 21732323 is about 4661.7939679913. The cubic root of 21732323 is about 279.0628661494.

The spelling of 21732323 in words is "twenty-one million, seven hundred thirty-two thousand, three hundred twenty-three".