213112011111 has 4 divisors (see below), whose sum is σ = 284149348152. Its totient is φ = 142074674072.

The previous prime is 213112011107. The next prime is 213112011121. The reversal of 213112011111 is 111110211312.

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 213112011111 - 2² = 213112011107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213112011121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35518668516 + ... + 35518668521.

It is an arithmetic number, because the mean of its divisors is an integer number (71037337038).

Almost surely, 2^213112011111 is an apocalyptic number.

213112011111 is a deficient number, since it is larger than the sum of its proper divisors (71037337041).

213112011111 is an equidigital number, since it uses as much as digits as its factorization.

213112011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71037337040.

The product of its (nonzero) digits is 12, while the sum is 15.

Adding to 213112011111 its reverse (111110211312), we get a palindrome (324222222423).

The spelling of 213112011111 in words is "two hundred thirteen billion, one hundred twelve million, eleven thousand, one hundred eleven".