215230211 has 4 divisors (see below), whose sum is σ = 245977392. Its totient is φ = 184483032.

The previous prime is 215230189. The next prime is 215230229. The reversal of 215230211 is 112032512.

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 215230211 - 2¹⁸ = 214968067 is a prime.

It is a Duffinian number.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 215230211.

It is not an unprimeable number, because it can be changed into a prime (215230291) 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, 15373580 + ... + 15373593.

It is an arithmetic number, because the mean of its divisors is an integer number (61494348).

Almost surely, 2^215230211 is an apocalyptic number.

215230211 is a deficient number, since it is larger than the sum of its proper divisors (30747181).

215230211 is an equidigital number, since it uses as much as digits as its factorization.

215230211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30747180.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 215230211 is about 14670.7263283043. The cubic root of 215230211 is about 599.2863839976.

Adding to 215230211 its reverse (112032512), we get a palindrome (327262723).

The spelling of 215230211 in words is "two hundred fifteen million, two hundred thirty thousand, two hundred eleven".