213211111 has 8 divisors (see below), whose sum is σ = 218764224. Its totient is φ = 207674880.

The previous prime is 213211099. The next prime is 213211139. The reversal of 213211111 is 111112312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 213211111 - 2¹¹ = 213209063 is a prime.

It is a Duffinian number.

213211111 is a modest number, since divided by 11111 gives 2132 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 213211091 and 213211100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213211151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23730 + ... + 31456.

It is an arithmetic number, because the mean of its divisors is an integer number (27345528).

Almost surely, 2^213211111 is an apocalyptic number.

213211111 is a deficient number, since it is larger than the sum of its proper divisors (5553113).

213211111 is an equidigital number, since it uses as much as digits as its factorization.

213211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8441.

The product of its digits is 12, while the sum is 13.

The square root of 213211111 is about 14601.7502717996. The cubic root of 213211111 is about 597.4065011287.

Adding to 213211111 its reverse (111112312), we get a palindrome (324323423).

The spelling of 213211111 in words is "two hundred thirteen million, two hundred eleven thousand, one hundred eleven".