221121443 has 2 divisors, whose sum is σ = 221121444. Its totient is φ = 221121442.

The previous prime is 221121413. The next prime is 221121493. The reversal of 221121443 is 344121122.

221121443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221121443 - 2²⁴ = 204344227 is a prime.

It is not a weakly prime, because it can be changed into another prime (221121403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110560721 + 110560722.

It is an arithmetic number, because the mean of its divisors is an integer number (110560722).

Almost surely, 2^221121443 is an apocalyptic number.

221121443 is a deficient number, since it is larger than the sum of its proper divisors (1).

221121443 is an equidigital number, since it uses as much as digits as its factorization.

221121443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 20.

The square root of 221121443 is about 14870.1527564447. The cubic root of 221121443 is about 604.7050840473.

Adding to 221121443 its reverse (344121122), we get a palindrome (565242565).

The spelling of 221121443 in words is "two hundred twenty-one million, one hundred twenty-one thousand, four hundred forty-three".