216522143 has 2 divisors, whose sum is σ = 216522144. Its totient is φ = 216522142.

The previous prime is 216522121. The next prime is 216522151. The reversal of 216522143 is 341225612.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216522143 - 2¹⁰ = 216521119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216522193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108261071 + 108261072.

It is an arithmetic number, because the mean of its divisors is an integer number (108261072).

Almost surely, 2^216522143 is an apocalyptic number.

216522143 is a deficient number, since it is larger than the sum of its proper divisors (1).

216522143 is an equidigital number, since it uses as much as digits as its factorization.

216522143 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 26.

The square root of 216522143 is about 14714.6914000940. The cubic root of 216522143 is about 600.4830766979.

Adding to 216522143 its reverse (341225612), we get a palindrome (557747755).

The spelling of 216522143 in words is "two hundred sixteen million, five hundred twenty-two thousand, one hundred forty-three".