211113121 has 4 divisors (see below), whose sum is σ = 211629700. Its totient is φ = 210596544.

The previous prime is 211113109. The next prime is 211113139. The reversal of 211113121 is 121311112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 127938721 + 83174400 = 11311^2 + 9120^2 .

It is a cyclic number.

It is not a de Polignac number, because 211113121 - 2⁹ = 211112609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211113521) 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, 257676 + ... + 258493.

It is an arithmetic number, because the mean of its divisors is an integer number (52907425).

Almost surely, 2^211113121 is an apocalyptic number.

It is an amenable number.

211113121 is a deficient number, since it is larger than the sum of its proper divisors (516579).

211113121 is an equidigital number, since it uses as much as digits as its factorization.

211113121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516578.

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

The square root of 211113121 is about 14529.7323099911. The cubic root of 211113121 is about 595.4405521932.

Adding to 211113121 its reverse (121311112), we get a palindrome (332424233).

The spelling of 211113121 in words is "two hundred eleven million, one hundred thirteen thousand, one hundred twenty-one".