111042120021 has 48 divisors (see below), whose sum is σ = 179831070720. Its totient is φ = 59691836160.

The previous prime is 111042120019. The next prime is 111042120041. The reversal of 111042120021 is 120021240111.

It is not a de Polignac number, because 111042120021 - 2¹ = 111042120019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111042120041) by changing a digit.

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 in 47 ways as a sum of consecutive naturals, for example, 22034020 + ... + 22039058.

It is an arithmetic number, because the mean of its divisors is an integer number (3746480640).

Almost surely, 2^111042120021 is an apocalyptic number.

It is an amenable number.

111042120021 is a deficient number, since it is larger than the sum of its proper divisors (68788950699).

111042120021 is a wasteful number, since it uses less digits than its factorization.

111042120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8714 (or 8697 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 111042120021 its reverse (120021240111), we get a palindrome (231063360132).

The spelling of 111042120021 in words is "one hundred eleven billion, forty-two million, one hundred twenty thousand, twenty-one".