11110121000021 has 4 divisors (see below), whose sum is σ = 11763657529452. Its totient is φ = 10456584470592.

The previous prime is 11110121000003. The next prime is 11110121000023. The reversal of 11110121000021 is 12000012101111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10169172499396 + 940948500625 = 3188914^2 + 970025^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11110121000021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11110120999966 and 11110121000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11110121000023) 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, 326768264690 + ... + 326768264723.

It is an arithmetic number, because the mean of its divisors is an integer number (2940914382363).

Almost surely, 2^{11110121000021} is an apocalyptic number.

It is an amenable number.

11110121000021 is a deficient number, since it is larger than the sum of its proper divisors (653536529431).

11110121000021 is an equidigital number, since it uses as much as digits as its factorization.

11110121000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653536529430.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 11110121000021 its reverse (12000012101111), we get a palindrome (23110133101132).

The spelling of 11110121000021 in words is "eleven trillion, one hundred ten billion, one hundred twenty-one million, twenty-one", and thus it is an aban number.