1111221211 has 4 divisors (see below), whose sum is σ = 1111434912. Its totient is φ = 1111007512.

The previous prime is 1111221203. The next prime is 1111221229. The reversal of 1111221211 is 1121221111.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1111221211 - 2³ = 1111221203 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1111221191 and 1111221200.

It is not an unprimeable number, because it can be changed into a prime (1111221271) 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, 98851 + ... + 109516.

It is an arithmetic number, because the mean of its divisors is an integer number (277858728).

Almost surely, 2^1111221211 is an apocalyptic number.

1111221211 is a deficient number, since it is larger than the sum of its proper divisors (213701).

1111221211 is an equidigital number, since it uses as much as digits as its factorization.

1111221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213700.

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

The square root of 1111221211 is about 33334.9847907570. The cubic root of 1111221211 is about 1035.7783781167.

Adding to 1111221211 its reverse (1121221111), we get a palindrome (2232442322).

It can be divided in two parts, 11112 and 21211, that added together give a palindrome (32323).

The spelling of 1111221211 in words is "one billion, one hundred eleven million, two hundred twenty-one thousand, two hundred eleven".