215011 has 4 divisors (see below), whose sum is σ = 216832. Its totient is φ = 213192.

The previous prime is 214993. The next prime is 215051. The reversal of 215011 is 110512.

It is a happy number.

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 215011 - 2⁷ = 214883 is a prime.

It is a Duffinian number.

215011 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (215051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 720 + ... + 973.

It is an arithmetic number, because the mean of its divisors is an integer number (54208).

2²¹⁵⁰¹¹ is an apocalyptic number.

215011 is a deficient number, since it is larger than the sum of its proper divisors (1821).

215011 is a wasteful number, since it uses less digits than its factorization.

215011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1820.

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

The square root of 215011 is about 463.6927862281. The cubic root of 215011 is about 59.9082858058.

Adding to 215011 its reverse (110512), we get a palindrome (325523).

The spelling of 215011 in words is "two hundred fifteen thousand, eleven".