21027343 has 2 divisors, whose sum is σ = 21027344. Its totient is φ = 21027342.

The previous prime is 21027341. The next prime is 21027367. The reversal of 21027343 is 34372012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21027343 - 2¹ = 21027341 is a prime.

Together with 21027341, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21027341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10513671 + 10513672.

It is an arithmetic number, because the mean of its divisors is an integer number (10513672).

Almost surely, 2^21027343 is an apocalyptic number.

21027343 is a deficient number, since it is larger than the sum of its proper divisors (1).

21027343 is an equidigital number, since it uses as much as digits as its factorization.

21027343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 21027343 is about 4585.5580903528. The cubic root of 21027343 is about 276.0121073944.

Adding to 21027343 its reverse (34372012), we get a palindrome (55399355).

The spelling of 21027343 in words is "twenty-one million, twenty-seven thousand, three hundred forty-three".