216243101 has 4 divisors (see below), whose sum is σ = 216302304. Its totient is φ = 216183900.

The previous prime is 216243091. The next prime is 216243149. The reversal of 216243101 is 101342612.

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.

It is a cyclic number.

It is not a de Polignac number, because 216243101 - 2⁶ = 216243037 is a prime.

It is a super-2 number, since 2×216243101² = 93522157460192402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216243191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23735 + ... + 31556.

It is an arithmetic number, because the mean of its divisors is an integer number (54075576).

Almost surely, 2^216243101 is an apocalyptic number.

It is an amenable number.

216243101 is a deficient number, since it is larger than the sum of its proper divisors (59203).

216243101 is an equidigital number, since it uses as much as digits as its factorization.

216243101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59202.

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

The square root of 216243101 is about 14705.2065949445. The cubic root of 216243101 is about 600.2250091261.

Adding to 216243101 its reverse (101342612), we get a palindrome (317585713).

The spelling of 216243101 in words is "two hundred sixteen million, two hundred forty-three thousand, one hundred one".