111342141521 has 4 divisors (see below), whose sum is σ = 119906921652. Its totient is φ = 102777361392.

The previous prime is 111342141517. The next prime is 111342141527. The reversal of 111342141521 is 125141243111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125141243111 = 2161 ⋅57908951.

It can be written as a sum of positive squares in 2 ways, for example, as 42627383296 + 68714758225 = 206464^2 + 262135^2 .

It is a cyclic number.

It is not a de Polignac number, because 111342141521 - 2² = 111342141517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111342141527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4282390046 + ... + 4282390071.

It is an arithmetic number, because the mean of its divisors is an integer number (29976730413).

Almost surely, 2^111342141521 is an apocalyptic number.

It is an amenable number.

111342141521 is a deficient number, since it is larger than the sum of its proper divisors (8564780131).

111342141521 is an equidigital number, since it uses as much as digits as its factorization.

111342141521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8564780130.

The product of its digits is 960, while the sum is 26.

Adding to 111342141521 its reverse (125141243111), we get a palindrome (236483384632).

The spelling of 111342141521 in words is "one hundred eleven billion, three hundred forty-two million, one hundred forty-one thousand, five hundred twenty-one".