221340143 has 2 divisors, whose sum is σ = 221340144. Its totient is φ = 221340142.

The previous prime is 221340131. The next prime is 221340149. The reversal of 221340143 is 341043122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221340143 - 2⁴ = 221340127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221340149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110670071 + 110670072.

It is an arithmetic number, because the mean of its divisors is an integer number (110670072).

Almost surely, 2^221340143 is an apocalyptic number.

221340143 is a deficient number, since it is larger than the sum of its proper divisors (1).

221340143 is an equidigital number, since it uses as much as digits as its factorization.

221340143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 221340143 is about 14877.5045958655. The cubic root of 221340143 is about 604.9043793965.

Adding to 221340143 its reverse (341043122), we get a palindrome (562383265).

The spelling of 221340143 in words is "two hundred twenty-one million, three hundred forty thousand, one hundred forty-three".