221231103420443 has 2 divisors, whose sum is σ = 221231103420444. Its totient is φ = 221231103420442.

The previous prime is 221231103420421. The next prime is 221231103420451. The reversal of 221231103420443 is 344024301132122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221231103420443 - 2¹⁰ = 221231103419419 is a prime.

It is a super-2 number, since 2×221231103420443² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221231193420443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110615551710221 + 110615551710222.

It is an arithmetic number, because the mean of its divisors is an integer number (110615551710222).

Almost surely, 2^{221231103420443} is an apocalyptic number.

221231103420443 is a deficient number, since it is larger than the sum of its proper divisors (1).

221231103420443 is an equidigital number, since it uses as much as digits as its factorization.

221231103420443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 221231103420443 its reverse (344024301132122), we get a palindrome (565255404552565).

The spelling of 221231103420443 in words is "two hundred twenty-one trillion, two hundred thirty-one billion, one hundred three million, four hundred twenty thousand, four hundred forty-three".