11111210211111 has 8 divisors (see below), whose sum is σ = 14815096402944. Its totient is φ = 7407398746680.

The previous prime is 11111210211109. The next prime is 11111210211281. The reversal of 11111210211111 is 11111201211111.

It is a happy number.

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

It is not a de Polignac number, because 11111210211111 - 2¹ = 11111210211109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111210211811) 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, 18333981 + ... + 18930326.

It is an arithmetic number, because the mean of its divisors is an integer number (1851887050368).

Almost surely, 2^{11111210211111} is an apocalyptic number.

11111210211111 is a deficient number, since it is larger than the sum of its proper divisors (3703886191833).

11111210211111 is an equidigital number, since it uses as much as digits as its factorization.

11111210211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37363701.

The product of its (nonzero) digits is 4, while the sum is 15.

Adding to 11111210211111 its reverse (11111201211111), we get a palindrome (22222411422222).

Subtracting from 11111210211111 its reverse (11111201211111), we obtain a square (9000000 = 3000²).

The spelling of 11111210211111 in words is "eleven trillion, one hundred eleven billion, two hundred ten million, two hundred eleven thousand, one hundred eleven".