213011111 has 4 divisors (see below), whose sum is σ = 213343032. Its totient is φ = 212679192.

The previous prime is 213011093. The next prime is 213011159. The reversal of 213011111 is 111110312.

It is a happy number.

213011111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 213011111 - 2⁶ = 213011047 is a prime.

It is a Duffinian number.

213011111 is a modest number, since divided by 11111 gives 2130 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 213011092 and 213011101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213011011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164996 + ... + 166281.

It is an arithmetic number, because the mean of its divisors is an integer number (53335758).

Almost surely, 2^213011111 is an apocalyptic number.

213011111 is a deficient number, since it is larger than the sum of its proper divisors (331921).

213011111 is an equidigital number, since it uses as much as digits as its factorization.

213011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331920.

The product of its (nonzero) digits is 6, while the sum is 11.

The square root of 213011111 is about 14594.9001709501. The cubic root of 213011111 is about 597.2196461403.

Adding to 213011111 its reverse (111110312), we get a palindrome (324121423).

The spelling of 213011111 in words is "two hundred thirteen million, eleven thousand, one hundred eleven".