215222211 has 16 divisors (see below), whose sum is σ = 319073920. Its totient is φ = 143379720.

The previous prime is 215222197. The next prime is 215222221. The reversal of 215222211 is 112222512.

It is not a de Polignac number, because 215222211 - 2⁷ = 215222083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215222221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70956 + ... + 73926.

It is an arithmetic number, because the mean of its divisors is an integer number (19942120).

Almost surely, 2^215222211 is an apocalyptic number.

215222211 is a deficient number, since it is larger than the sum of its proper divisors (103851709).

215222211 is a wasteful number, since it uses less digits than its factorization.

215222211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5663 (or 5657 counting only the distinct ones).

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

The square root of 215222211 is about 14670.4536739666. The cubic root of 215222211 is about 599.2789588465.

Adding to 215222211 its reverse (112222512), we get a palindrome (327444723).

The spelling of 215222211 in words is "two hundred fifteen million, two hundred twenty-two thousand, two hundred eleven".