21311223030043 has 2 divisors, whose sum is σ = 21311223030044. Its totient is φ = 21311223030042.

The previous prime is 21311223030029. The next prime is 21311223030047. The reversal of 21311223030043 is 34003032211312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21311223030043 - 2¹⁷ = 21311222898971 is a prime.

It is not a weakly prime, because it can be changed into another prime (21311223030047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655611515021 + 10655611515022.

It is an arithmetic number, because the mean of its divisors is an integer number (10655611515022).

Almost surely, 2^{21311223030043} is an apocalyptic number.

21311223030043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21311223030043 is an equidigital number, since it uses as much as digits as its factorization.

21311223030043 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 21311223030043 its reverse (34003032211312), we get a palindrome (55314255241355).

The spelling of 21311223030043 in words is "twenty-one trillion, three hundred eleven billion, two hundred twenty-three million, thirty thousand, forty-three".