111121220011 has 4 divisors (see below), whose sum is σ = 111610741032. Its totient is φ = 110631698992.

The previous prime is 111121219879. The next prime is 111121220027. The reversal of 111121220011 is 110022121111.

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 111121220011 - 2²¹ = 111119122859 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111121219973 and 111121220000.

It is not an unprimeable number, because it can be changed into a prime (111121220051) 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, 244760170 + ... + 244760623.

It is an arithmetic number, because the mean of its divisors is an integer number (27902685258).

Almost surely, 2^111121220011 is an apocalyptic number.

111121220011 is a deficient number, since it is larger than the sum of its proper divisors (489521021).

111121220011 is an equidigital number, since it uses as much as digits as its factorization.

111121220011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489521020.

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

Adding to 111121220011 its reverse (110022121111), we get a palindrome (221143341122).

The spelling of 111121220011 in words is "one hundred eleven billion, one hundred twenty-one million, two hundred twenty thousand, eleven".