213122211 has 4 divisors (see below), whose sum is σ = 284162952. Its totient is φ = 142081472.

The previous prime is 213122201. The next prime is 213122213. The reversal of 213122211 is 112221312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 213122211 - 2¹¹ = 213120163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213122213) 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 3 ways as a sum of consecutive naturals, for example, 35520366 + ... + 35520371.

It is an arithmetic number, because the mean of its divisors is an integer number (71040738).

Almost surely, 2^213122211 is an apocalyptic number.

213122211 is a deficient number, since it is larger than the sum of its proper divisors (71040741).

213122211 is an equidigital number, since it uses as much as digits as its factorization.

213122211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71040740.

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

The square root of 213122211 is about 14598.7057988029. The cubic root of 213122211 is about 597.3234585191.

Adding to 213122211 its reverse (112221312), we get a palindrome (325343523).

It can be divided in two parts, 2131 and 22211, that added together give a palindrome (24342).

The spelling of 213122211 in words is "two hundred thirteen million, one hundred twenty-two thousand, two hundred eleven".