215101 has 4 divisors (see below), whose sum is σ = 227772. Its totient is φ = 202432.

The previous prime is 215087. The next prime is 215123. The reversal of 215101 is 101512.

It is a happy number.

215101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 63001 + 152100 = 251^2 + 390^2 .

It is a cyclic number.

It is not a de Polignac number, because 215101 - 2⁹ = 214589 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 (215141) 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, 6310 + ... + 6343.

It is an arithmetic number, because the mean of its divisors is an integer number (56943).

2²¹⁵¹⁰¹ is an apocalyptic number.

It is an amenable number.

215101 is a deficient number, since it is larger than the sum of its proper divisors (12671).

215101 is a wasteful number, since it uses less digits than its factorization.

215101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12670.

The product of its (nonzero) digits is 10, while the sum is 10.

The square root of 215101 is about 463.7898230880. The cubic root of 215101 is about 59.9166435078.

Adding to 215101 its reverse (101512), we get a palindrome (316613).

The spelling of 215101 in words is "two hundred fifteen thousand, one hundred one".