215105211 has 6 divisors (see below), whose sum is σ = 310707540. Its totient is φ = 143403468.

The previous prime is 215105183. The next prime is 215105227. The reversal of 215105211 is 112501512.

It is not a de Polignac number, because 215105211 - 2⁵ = 215105179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215105411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11950281 + ... + 11950298.

It is an arithmetic number, because the mean of its divisors is an integer number (51784590).

Almost surely, 2^215105211 is an apocalyptic number.

215105211 is a deficient number, since it is larger than the sum of its proper divisors (95602329).

215105211 is a wasteful number, since it uses less digits than its factorization.

215105211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23900585 (or 23900582 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 215105211 is about 14666.4655251359. The cubic root of 215105211 is about 599.1703449830.

Adding to 215105211 its reverse (112501512), we get a palindrome (327606723).

The spelling of 215105211 in words is "two hundred fifteen million, one hundred five thousand, two hundred eleven".