216216911 has 4 divisors (see below), whose sum is σ = 216351432. Its totient is φ = 216082392.

The previous prime is 216216907. The next prime is 216216929. The reversal of 216216911 is 119612612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216216911 - 2² = 216216907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216216901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64820 + ... + 68073.

It is an arithmetic number, because the mean of its divisors is an integer number (54087858).

Almost surely, 2^216216911 is an apocalyptic number.

216216911 is a deficient number, since it is larger than the sum of its proper divisors (134521).

216216911 is a wasteful number, since it uses less digits than its factorization.

216216911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134520.

The product of its digits is 1296, while the sum is 29.

The square root of 216216911 is about 14704.3160670600. The cubic root of 216216911 is about 600.2007763258.

The spelling of 216216911 in words is "two hundred sixteen million, two hundred sixteen thousand, nine hundred eleven".