211311121 has 4 divisors (see below), whose sum is σ = 241498432. Its totient is φ = 181123812.

The previous prime is 211311119. The next prime is 211311151. The reversal of 211311121 is 121113112.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 211311121 - 2¹ = 211311119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (211311101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15093645 + ... + 15093658.

It is an arithmetic number, because the mean of its divisors is an integer number (60374608).

Almost surely, 2^211311121 is an apocalyptic number.

It is an amenable number.

211311121 is a deficient number, since it is larger than the sum of its proper divisors (30187311).

211311121 is an equidigital number, since it uses as much as digits as its factorization.

211311121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30187310.

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

The square root of 211311121 is about 14536.5443280031. The cubic root of 211311121 is about 595.6266457749.

Adding to 211311121 its reverse (121113112), we get a palindrome (332424233).

The spelling of 211311121 in words is "two hundred eleven million, three hundred eleven thousand, one hundred twenty-one".