21223212311243 has 2 divisors, whose sum is σ = 21223212311244. Its totient is φ = 21223212311242.

The previous prime is 21223212311227. The next prime is 21223212311363. The reversal of 21223212311243 is 34211321232212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21223212311243 - 2⁴ = 21223212311227 is a prime.

It is not a weakly prime, because it can be changed into another prime (21223212311443) 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, 10611606155621 + 10611606155622.

It is an arithmetic number, because the mean of its divisors is an integer number (10611606155622).

Almost surely, 2^{21223212311243} is an apocalyptic number.

21223212311243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223212311243 is an equidigital number, since it uses as much as digits as its factorization.

21223212311243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 29.

Adding to 21223212311243 its reverse (34211321232212), we get a palindrome (55434533543455).

The spelling of 21223212311243 in words is "twenty-one trillion, two hundred twenty-three billion, two hundred twelve million, three hundred eleven thousand, two hundred forty-three".