211021111121 has 4 divisors (see below), whose sum is σ = 211042421232. Its totient is φ = 210999801012.

The previous prime is 211021111117. The next prime is 211021111139. The reversal of 211021111121 is 121111120112.

211021111121 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 a cyclic number.

It is not a de Polignac number, because 211021111121 - 2² = 211021111117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211021111096 and 211021111105.

It is not an unprimeable number, because it can be changed into a prime (211021111921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10640195 + ... + 10660008.

It is an arithmetic number, because the mean of its divisors is an integer number (52760605308).

Almost surely, 2^211021111121 is an apocalyptic number.

It is an amenable number.

211021111121 is a deficient number, since it is larger than the sum of its proper divisors (21310111).

211021111121 is an equidigital number, since it uses as much as digits as its factorization.

211021111121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21310110.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 211021111121 its reverse (121111120112), we get a palindrome (332132231233).

The spelling of 211021111121 in words is "two hundred eleven billion, twenty-one million, one hundred eleven thousand, one hundred twenty-one".