12110120021 has 4 divisors (see below), whose sum is σ = 12405488844. Its totient is φ = 11814751200.

The previous prime is 12110119999. The next prime is 12110120047. The reversal of 12110120021 is 12002101121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12002101121 = 3323 ⋅3611827.

It can be written as a sum of positive squares in 2 ways, for example, as 6804600100 + 5305519921 = 82490^2 + 72839^2 .

It is a cyclic number.

It is not a de Polignac number, because 12110120021 - 2²² = 12105925717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12110119984 and 12110120011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12110120621) 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, 147684350 + ... + 147684431.

It is an arithmetic number, because the mean of its divisors is an integer number (3101372211).

Almost surely, 2^12110120021 is an apocalyptic number.

It is an amenable number.

12110120021 is a deficient number, since it is larger than the sum of its proper divisors (295368823).

12110120021 is an equidigital number, since it uses as much as digits as its factorization.

12110120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295368822.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 12110120021 its reverse (12002101121), we get a palindrome (24112221142).

The spelling of 12110120021 in words is "twelve billion, one hundred ten million, one hundred twenty thousand, twenty-one".