216135443 has 2 divisors, whose sum is σ = 216135444. Its totient is φ = 216135442.

The previous prime is 216135421. The next prime is 216135449. The reversal of 216135443 is 344531612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216135443 - 2²² = 211941139 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216135449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108067721 + 108067722.

It is an arithmetic number, because the mean of its divisors is an integer number (108067722).

Almost surely, 2^216135443 is an apocalyptic number.

216135443 is a deficient number, since it is larger than the sum of its proper divisors (1).

216135443 is an equidigital number, since it uses as much as digits as its factorization.

216135443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 29.

The square root of 216135443 is about 14701.5455990178. The cubic root of 216135443 is about 600.1253839815.

The spelling of 216135443 in words is "two hundred sixteen million, one hundred thirty-five thousand, four hundred forty-three".