111101120211221 has 24 divisors (see below), whose sum is σ = 129917651491584. Its totient is φ = 94730327677440.

The previous prime is 111101120211149. The next prime is 111101120211239. The reversal of 111101120211221 is 122112021101111.

It is a de Polignac number, because none of the positive numbers 2^k-111101120211221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111101120211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111101120216221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 158177276 + ... + 158878106.

It is an arithmetic number, because the mean of its divisors is an integer number (5413235478816).

Almost surely, 2^{111101120211221} is an apocalyptic number.

It is an amenable number.

111101120211221 is a deficient number, since it is larger than the sum of its proper divisors (18816531280363).

111101120211221 is a wasteful number, since it uses less digits than its factorization.

111101120211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717801 (or 717794 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 111101120211221 its reverse (122112021101111), we get a palindrome (233213141312332).

The spelling of 111101120211221 in words is "one hundred eleven trillion, one hundred one billion, one hundred twenty million, two hundred eleven thousand, two hundred twenty-one".