221022143 has 2 divisors, whose sum is σ = 221022144. Its totient is φ = 221022142.

The previous prime is 221022097. The next prime is 221022187. The reversal of 221022143 is 341220122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221022143 - 2¹² = 221018047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221022743) 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, 110511071 + 110511072.

It is an arithmetic number, because the mean of its divisors is an integer number (110511072).

Almost surely, 2^221022143 is an apocalyptic number.

221022143 is a deficient number, since it is larger than the sum of its proper divisors (1).

221022143 is an equidigital number, since it uses as much as digits as its factorization.

221022143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 221022143 is about 14866.8134783483. The cubic root of 221022143 is about 604.6145512842.

Adding to 221022143 its reverse (341220122), we get a palindrome (562242265).

The spelling of 221022143 in words is "two hundred twenty-one million, twenty-two thousand, one hundred forty-three".