21023340043 has 2 divisors, whose sum is σ = 21023340044. Its totient is φ = 21023340042.

The previous prime is 21023340017. The next prime is 21023340061. The reversal of 21023340043 is 34004332012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21023340043 - 2⁹ = 21023339531 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21023339996 and 21023340023.

It is not a weakly prime, because it can be changed into another prime (21023340643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511670021 + 10511670022.

It is an arithmetic number, because the mean of its divisors is an integer number (10511670022).

Almost surely, 2^21023340043 is an apocalyptic number.

21023340043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023340043 is an equidigital number, since it uses as much as digits as its factorization.

21023340043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21023340043 its reverse (34004332012), we get a palindrome (55027672055).

The spelling of 21023340043 in words is "twenty-one billion, twenty-three million, three hundred forty thousand, forty-three".