111544021 has 16 divisors (see below), whose sum is σ = 121480128. Its totient is φ = 102009600.

The previous prime is 111544009. The next prime is 111544031. The reversal of 111544021 is 120445111.

It is a cyclic number.

It is not a de Polignac number, because 111544021 - 2⁵ = 111543989 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 111544021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111544031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241731 + ... + 242191.

It is an arithmetic number, because the mean of its divisors is an integer number (7592508).

Almost surely, 2^111544021 is an apocalyptic number.

It is an amenable number.

111544021 is a deficient number, since it is larger than the sum of its proper divisors (9936107).

111544021 is a wasteful number, since it uses less digits than its factorization.

111544021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852.

The product of its (nonzero) digits is 160, while the sum is 19.

The square root of 111544021 is about 10561.4402900362. The cubic root of 111544021 is about 481.3734117408.

Adding to 111544021 its reverse (120445111), we get a palindrome (231989132).

The spelling of 111544021 in words is "one hundred eleven million, five hundred forty-four thousand, twenty-one".