211223211 has 16 divisors (see below), whose sum is σ = 291862560. Its totient is φ = 135717120.

The previous prime is 211223137. The next prime is 211223231. The reversal of 211223211 is 112322112.

It is not a de Polignac number, because 211223211 - 2¹³ = 211215019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (211223231) 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, 55671 + ... + 59343.

It is an arithmetic number, because the mean of its divisors is an integer number (18241410).

Almost surely, 2^211223211 is an apocalyptic number.

211223211 is a deficient number, since it is larger than the sum of its proper divisors (80639349).

211223211 is a wasteful number, since it uses less digits than its factorization.

211223211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4366.

The product of its digits is 48, while the sum is 15.

The square root of 211223211 is about 14533.5202549142. The cubic root of 211223211 is about 595.5440364592.

Adding to 211223211 its reverse (112322112), we get a palindrome (323545323).

The spelling of 211223211 in words is "two hundred eleven million, two hundred twenty-three thousand, two hundred eleven".