221438143 has 2 divisors, whose sum is σ = 221438144. Its totient is φ = 221438142.

The previous prime is 221438117. The next prime is 221438183. The reversal of 221438143 is 341834122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221438143 - 2⁵ = 221438111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221438183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110719071 + 110719072.

It is an arithmetic number, because the mean of its divisors is an integer number (110719072).

Almost surely, 2^221438143 is an apocalyptic number.

221438143 is a deficient number, since it is larger than the sum of its proper divisors (1).

221438143 is an equidigital number, since it uses as much as digits as its factorization.

221438143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 28.

The square root of 221438143 is about 14880.7977944733. The cubic root of 221438143 is about 604.9936415332.

The spelling of 221438143 in words is "two hundred twenty-one million, four hundred thirty-eight thousand, one hundred forty-three".