21342443 has 2 divisors, whose sum is σ = 21342444. Its totient is φ = 21342442.

The previous prime is 21342437. The next prime is 21342449. The reversal of 21342443 is 34424312.

It is a balanced prime because it is at equal distance from previous prime (21342437) and next prime (21342449).

It is a cyclic number.

It is not a de Polignac number, because 21342443 - 2⁶ = 21342379 is a prime.

It is not a weakly prime, because it can be changed into another prime (21342449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671221 + 10671222.

It is an arithmetic number, because the mean of its divisors is an integer number (10671222).

Almost surely, 2^21342443 is an apocalyptic number.

21342443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21342443 is an equidigital number, since it uses as much as digits as its factorization.

21342443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 23.

The square root of 21342443 is about 4619.7881986082. The cubic root of 21342443 is about 277.3839809356.

Adding to 21342443 its reverse (34424312), we get a palindrome (55766755).

The spelling of 21342443 in words is "twenty-one million, three hundred forty-two thousand, four hundred forty-three".