216101 has 4 divisors (see below), whose sum is σ = 223104. Its totient is φ = 209100.

The previous prime is 216091. The next prime is 216103. The reversal of 216101 is 101612.

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 216101 - 2⁶ = 216037 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216101.

It is not an unprimeable number, because it can be changed into a prime (216103) 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, 3455 + ... + 3516.

It is an arithmetic number, because the mean of its divisors is an integer number (55776).

2²¹⁶¹⁰¹ is an apocalyptic number.

It is an amenable number.

216101 is a deficient number, since it is larger than the sum of its proper divisors (7003).

216101 is an equidigital number, since it uses as much as digits as its factorization.

216101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7002.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 216101 is about 464.8666475453. The cubic root of 216101 is about 60.0093503946.

Adding to 216101 its reverse (101612), we get a palindrome (317713).

The spelling of 216101 in words is "two hundred sixteen thousand, one hundred one".