111542020452121 has 24 divisors (see below), whose sum is σ = 137405515104000. Its totient is φ = 89970362681472.

The previous prime is 111542020452119. The next prime is 111542020452127. The reversal of 111542020452121 is 121254020245111.

It is a happy number.

It is not a de Polignac number, because 111542020452121 - 2¹ = 111542020452119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111542020452127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4038621 + ... + 15472378.

It is an arithmetic number, because the mean of its divisors is an integer number (5725229796000).

Almost surely, 2^{111542020452121} is an apocalyptic number.

It is an amenable number.

111542020452121 is a deficient number, since it is larger than the sum of its proper divisors (25863494651879).

111542020452121 is a wasteful number, since it uses less digits than its factorization.

111542020452121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19517893 (or 19517886 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

Adding to 111542020452121 its reverse (121254020245111), we get a palindrome (232796040697232).

The spelling of 111542020452121 in words is "one hundred eleven trillion, five hundred forty-two billion, twenty million, four hundred fifty-two thousand, one hundred twenty-one".