110111421521 has 4 divisors (see below), whose sum is σ = 110850424500. Its totient is φ = 109372418544.

The previous prime is 110111421517. The next prime is 110111421529. The reversal of 110111421521 is 125124111011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125124111011 = 181 ⋅691293431.

It can be written as a sum of positive squares in 2 ways, for example, as 48560292496 + 61551129025 = 220364^2 + 248095^2 .

It is a cyclic number.

It is not a de Polignac number, because 110111421521 - 2² = 110111421517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 110111421493 and 110111421502.

It is not an unprimeable number, because it can be changed into a prime (110111421529) 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, 369501266 + ... + 369501563.

It is an arithmetic number, because the mean of its divisors is an integer number (27712606125).

Almost surely, 2^110111421521 is an apocalyptic number.

It is an amenable number.

110111421521 is a deficient number, since it is larger than the sum of its proper divisors (739002979).

110111421521 is an equidigital number, since it uses as much as digits as its factorization.

110111421521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739002978.

The product of its (nonzero) digits is 80, while the sum is 20.

Adding to 110111421521 its reverse (125124111011), we get a palindrome (235235532532).

The spelling of 110111421521 in words is "one hundred ten billion, one hundred eleven million, four hundred twenty-one thousand, five hundred twenty-one".