216342011 has 2 divisors, whose sum is σ = 216342012. Its totient is φ = 216342010.

The previous prime is 216341977. The next prime is 216342013. The reversal of 216342011 is 110243612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216342011 - 2¹⁸ = 216079867 is a prime.

Together with 216342013, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (216342013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108171005 + 108171006.

It is an arithmetic number, because the mean of its divisors is an integer number (108171006).

Almost surely, 2^216342011 is an apocalyptic number.

216342011 is a deficient number, since it is larger than the sum of its proper divisors (1).

216342011 is an equidigital number, since it uses as much as digits as its factorization.

216342011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 216342011 is about 14708.5693050004. The cubic root of 216342011 is about 600.3165098583.

Adding to 216342011 its reverse (110243612), we get a palindrome (326585623).

The spelling of 216342011 in words is "two hundred sixteen million, three hundred forty-two thousand, eleven".