111021221144 has 8 divisors (see below), whose sum is σ = 208164789660. Its totient is φ = 55510610568.

The previous prime is 111021221137. The next prime is 111021221161. The reversal of 111021221144 is 441122120111.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6938826314 + ... + 6938826329.

Almost surely, 2^111021221144 is an apocalyptic number.

It is an amenable number.

111021221144 is a deficient number, since it is larger than the sum of its proper divisors (97143568516).

111021221144 is a wasteful number, since it uses less digits than its factorization.

111021221144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13877652649 (or 13877652645 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 111021221144 its reverse (441122120111), we get a palindrome (552143341255).

The spelling of 111021221144 in words is "one hundred eleven billion, twenty-one million, two hundred twenty-one thousand, one hundred forty-four".