2111121211 has 4 divisors (see below), whose sum is σ = 2111222152. Its totient is φ = 2111020272.

The previous prime is 2111121209. The next prime is 2111121239. The reversal of 2111121211 is 1121211112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2111121211 - 2¹ = 2111121209 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111121191 and 2111121200.

It is not an unprimeable number, because it can be changed into a prime (2111121241) 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, 6090 + ... + 65263.

It is an arithmetic number, because the mean of its divisors is an integer number (527805538).

Almost surely, 2^2111121211 is an apocalyptic number.

2111121211 is a deficient number, since it is larger than the sum of its proper divisors (100941).

2111121211 is an equidigital number, since it uses as much as digits as its factorization.

2111121211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100940.

The product of its digits is 8, while the sum is 13.

The square root of 2111121211 is about 45946.9390819454. The cubic root of 2111121211 is about 1282.8357561820.

Adding to 2111121211 its reverse (1121211112), we get a palindrome (3232332323).

The spelling of 2111121211 in words is "two billion, one hundred eleven million, one hundred twenty-one thousand, two hundred eleven".