213213111 has 16 divisors (see below), whose sum is σ = 287705088. Its totient is φ = 140441600.

The previous prime is 213213089. The next prime is 213213127. The reversal of 213213111 is 111312312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 213213111 - 2²¹ = 211115959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213213181) 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 15 ways as a sum of consecutive naturals, for example, 99946 + ... + 102056.

It is an arithmetic number, because the mean of its divisors is an integer number (17981568).

Almost surely, 2^213213111 is an apocalyptic number.

213213111 is a deficient number, since it is larger than the sum of its proper divisors (74491977).

213213111 is a wasteful number, since it uses less digits than its factorization.

213213111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2502.

The product of its digits is 36, while the sum is 15.

The square root of 213213111 is about 14601.8187565796. The cubic root of 213213111 is about 597.4083690883.

Adding to 213213111 its reverse (111312312), we get a palindrome (324525423).

The spelling of 213213111 in words is "two hundred thirteen million, two hundred thirteen thousand, one hundred eleven".