21446443 has 2 divisors, whose sum is σ = 21446444. Its totient is φ = 21446442.

The previous prime is 21446437. The next prime is 21446461. The reversal of 21446443 is 34464412.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21446443 is a prime.

It is not a weakly prime, because it can be changed into another prime (21449443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10723221 + 10723222.

It is an arithmetic number, because the mean of its divisors is an integer number (10723222).

Almost surely, 2^21446443 is an apocalyptic number.

21446443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21446443 is an equidigital number, since it uses as much as digits as its factorization.

21446443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 28.

The square root of 21446443 is about 4631.0304468876. The cubic root of 21446443 is about 277.8338076428.

The spelling of 21446443 in words is "twenty-one million, four hundred forty-six thousand, four hundred forty-three".