21734443 has 2 divisors, whose sum is σ = 21734444. Its totient is φ = 21734442.

The previous prime is 21734437. The next prime is 21734459. The reversal of 21734443 is 34443712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21734443 - 2⁵ = 21734411 is a prime.

It is not a weakly prime, because it can be changed into another prime (21738443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10867221 + 10867222.

It is an arithmetic number, because the mean of its divisors is an integer number (10867222).

Almost surely, 2^21734443 is an apocalyptic number.

21734443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21734443 is an equidigital number, since it uses as much as digits as its factorization.

21734443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 28.

The square root of 21734443 is about 4662.0213427225. The cubic root of 21734443 is about 279.0719400994.

The spelling of 21734443 in words is "twenty-one million, seven hundred thirty-four thousand, four hundred forty-three".