2111221211 has 8 divisors (see below), whose sum is σ = 2438630064. Its totient is φ = 1806392320.

The previous prime is 2111221207. The next prime is 2111221213. The reversal of 2111221211 is 1121221112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2111221211 - 2² = 2111221207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2111221213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5644790 + ... + 5645163.

It is an arithmetic number, because the mean of its divisors is an integer number (304828758).

Almost surely, 2^2111221211 is an apocalyptic number.

2111221211 is a deficient number, since it is larger than the sum of its proper divisors (327408853).

2111221211 is a wasteful number, since it uses less digits than its factorization.

2111221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11289981.

The product of its digits is 16, while the sum is 14.

The square root of 2111221211 is about 45948.0272808311. The cubic root of 2111221211 is about 1282.8560110667.

Adding to 2111221211 its reverse (1121221112), we get a palindrome (3232442323).

Subtracting from 2111221211 its reverse (1121221112), we obtain a palindrome (990000099).

It can be divided in two parts, 2111 and 221211, that added together give a palindrome (223322).

The spelling of 2111221211 in words is "two billion, one hundred eleven million, two hundred twenty-one thousand, two hundred eleven".