211222291 has 6 divisors (see below), whose sum is σ = 245707620. Its totient is φ = 181047636.

The previous prime is 211222289. The next prime is 211222303. The reversal of 211222291 is 192222112.

It is not a de Polignac number, because 211222291 - 2¹ = 211222289 is a prime.

It is a super-2 number, since 2×211222291² = 89229712430577362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211222211) 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, 2155281 + ... + 2155378.

It is an arithmetic number, because the mean of its divisors is an integer number (40951270).

Almost surely, 2^211222291 is an apocalyptic number.

211222291 is a deficient number, since it is larger than the sum of its proper divisors (34485329).

211222291 is an equidigital number, since it uses as much as digits as its factorization.

211222291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4310673 (or 4310666 counting only the distinct ones).

The product of its digits is 288, while the sum is 22.

The square root of 211222291 is about 14533.4886039106. The cubic root of 211222291 is about 595.5431718110.

The spelling of 211222291 in words is "two hundred eleven million, two hundred twenty-two thousand, two hundred ninety-one".