213122111 has 6 divisors (see below), whose sum is σ = 217755360. Its totient is φ = 208585436.

The previous prime is 213122099. The next prime is 213122137. The reversal of 213122111 is 111221312.

It is not a de Polignac number, because 213122111 - 2²⁶ = 146013247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213122311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 46031 + ... + 50448.

It is an arithmetic number, because the mean of its divisors is an integer number (36292560).

Almost surely, 2^213122111 is an apocalyptic number.

213122111 is a deficient number, since it is larger than the sum of its proper divisors (4633249).

213122111 is an frugal number, since it uses more digits than its factorization.

213122111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96573 (or 96526 counting only the distinct ones).

The product of its digits is 24, while the sum is 14.

The square root of 213122111 is about 14598.7023738413. The cubic root of 213122111 is about 597.3233650949.

Adding to 213122111 its reverse (111221312), we get a palindrome (324343423).

It can be divided in two parts, 2131 and 22111, that added together give a palindrome (24242).

The spelling of 213122111 in words is "two hundred thirteen million, one hundred twenty-two thousand, one hundred eleven".