216530201 has 4 divisors (see below), whose sum is σ = 216559632. Its totient is φ = 216500772.

The previous prime is 216530189. The next prime is 216530219. The reversal of 216530201 is 102035612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 216530201 - 2²² = 212335897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216530291) 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, 7310 + ... + 22056.

It is an arithmetic number, because the mean of its divisors is an integer number (54139908).

Almost surely, 2^216530201 is an apocalyptic number.

It is an amenable number.

216530201 is a deficient number, since it is larger than the sum of its proper divisors (29431).

216530201 is a wasteful number, since it uses less digits than its factorization.

216530201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29430.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 216530201 is about 14714.9652055314. The cubic root of 216530201 is about 600.4905257168.

Adding to 216530201 its reverse (102035612), we get a palindrome (318565813).

The spelling of 216530201 in words is "two hundred sixteen million, five hundred thirty thousand, two hundred one".