213111113 has 4 divisors (see below), whose sum is σ = 217645440. Its totient is φ = 208576788.

The previous prime is 213111061. The next prime is 213111131. The reversal of 213111113 is 311111312.

It is a happy number.

213111113 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 213111113 - 2¹² = 213107017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213111013) 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, 2267093 + ... + 2267186.

It is an arithmetic number, because the mean of its divisors is an integer number (54411360).

Almost surely, 2^213111113 is an apocalyptic number.

It is an amenable number.

213111113 is a deficient number, since it is larger than the sum of its proper divisors (4534327).

213111113 is an equidigital number, since it uses as much as digits as its factorization.

213111113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4534326.

The product of its digits is 18, while the sum is 14.

The square root of 213111113 is about 14598.3256916675. The cubic root of 213111113 is about 597.3130901163.

Adding to 213111113 its reverse (311111312), we get a palindrome (524222425).

The spelling of 213111113 in words is "two hundred thirteen million, one hundred eleven thousand, one hundred thirteen".