111440421021 has 16 divisors (see below), whose sum is σ = 153459960320. Its totient is φ = 71859735360.

The previous prime is 111440421013. The next prime is 111440421049. The reversal of 111440421021 is 120124044111.

It is not a de Polignac number, because 111440421021 - 2³ = 111440421013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111440426021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130186 + ... + 489723.

It is an arithmetic number, because the mean of its divisors is an integer number (9591247520).

Almost surely, 2^111440421021 is an apocalyptic number.

It is an amenable number.

111440421021 is a deficient number, since it is larger than the sum of its proper divisors (42019539299).

111440421021 is a wasteful number, since it uses less digits than its factorization.

111440421021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621876.

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 111440421021 its reverse (120124044111), we get a palindrome (231564465132).

The spelling of 111440421021 in words is "one hundred eleven billion, four hundred forty million, four hundred twenty-one thousand, twenty-one".