11111001211111 has 4 divisors (see below), whose sum is σ = 11111579717392. Its totient is φ = 11110422704832.

The previous prime is 11111001211097. The next prime is 11111001211153. The reversal of 11111001211111 is 11111210011111.

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 11111001211111 - 2⁷ = 11111001210983 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11111001211091 and 11111001211100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111001211411) 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, 289224330 + ... + 289262743.

It is an arithmetic number, because the mean of its divisors is an integer number (2777894929348).

Almost surely, 2^{11111001211111} is an apocalyptic number.

11111001211111 is a deficient number, since it is larger than the sum of its proper divisors (578506281).

11111001211111 is an equidigital number, since it uses as much as digits as its factorization.

11111001211111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578506280.

The product of its (nonzero) digits is 2, while the sum is 13.

Adding to 11111001211111 its reverse (11111210011111), we get a palindrome (22222211222222).

The spelling of 11111001211111 in words is "eleven trillion, one hundred eleven billion, one million, two hundred eleven thousand, one hundred eleven".