21304322443 has 2 divisors, whose sum is σ = 21304322444. Its totient is φ = 21304322442.

The previous prime is 21304322399. The next prime is 21304322453. The reversal of 21304322443 is 34422340312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21304322443 is a prime.

It is not a weakly prime, because it can be changed into another prime (21304322453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10652161221 + 10652161222.

It is an arithmetic number, because the mean of its divisors is an integer number (10652161222).

Almost surely, 2^21304322443 is an apocalyptic number.

21304322443 is a deficient number, since it is larger than the sum of its proper divisors (1).

21304322443 is an equidigital number, since it uses as much as digits as its factorization.

21304322443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 21304322443 its reverse (34422340312), we get a palindrome (55726662755).

The spelling of 21304322443 in words is "twenty-one billion, three hundred four million, three hundred twenty-two thousand, four hundred forty-three".