11111222211 has 32 divisors (see below), whose sum is σ = 16059590400. Its totient is φ = 6809443200.

The previous prime is 11111222207. The next prime is 11111222273. The reversal of 11111222211 is 11222211111.

It is a happy number.

It is not a de Polignac number, because 11111222211 - 2² = 11111222207 is a prime.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (11111222411) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 792361 + ... + 806261.

It is an arithmetic number, because the mean of its divisors is an integer number (501862200).

Almost surely, 2^11111222211 is an apocalyptic number.

11111222211 is a deficient number, since it is larger than the sum of its proper divisors (4948368189).

11111222211 is a wasteful number, since it uses less digits than its factorization.

11111222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14339.

The product of its digits is 16, while the sum is 15.

Adding to 11111222211 its reverse (11222211111), we get a palindrome (22333433322).

It can be divided in two parts, 111 and 11222211, that multiplied together give a palindrome (1245665421).

The spelling of 11111222211 in words is "eleven billion, one hundred eleven million, two hundred twenty-two thousand, two hundred eleven".