215420211 has 12 divisors (see below), whose sum is σ = 314071992. Its totient is φ = 142270656.

The previous prime is 215420201. The next prime is 215420213. The reversal of 215420211 is 112024512.

It is not a de Polignac number, because 215420211 - 2¹⁰ = 215419187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215420213) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 110886 + ... + 112811.

It is an arithmetic number, because the mean of its divisors is an integer number (26172666).

Almost surely, 2^215420211 is an apocalyptic number.

215420211 is a deficient number, since it is larger than the sum of its proper divisors (98651781).

215420211 is a wasteful number, since it uses less digits than its factorization.

215420211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223810 (or 223807 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 215420211 is about 14677.2003801815. The cubic root of 215420211 is about 599.4626772841.

Adding to 215420211 its reverse (112024512), we get a palindrome (327444723).

The spelling of 215420211 in words is "two hundred fifteen million, four hundred twenty thousand, two hundred eleven".