11110121021 has 2 divisors, whose sum is σ = 11110121022. Its totient is φ = 11110121020.

The previous prime is 11110120999. The next prime is 11110121023. The reversal of 11110121021 is 12012101111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7764076996 + 3346044025 = 88114^2 + 57845^2 .

It is a cyclic number.

It is not a de Polignac number, because 11110121021 - 2¹⁰ = 11110119997 is a prime.

Together with 11110121023, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 11110120993 and 11110121011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11110121023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555060510 + 5555060511.

It is an arithmetic number, because the mean of its divisors is an integer number (5555060511).

Almost surely, 2^11110121021 is an apocalyptic number.

It is an amenable number.

11110121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11110121021 is an equidigital number, since it uses as much as digits as its factorization.

11110121021 is an odious number, because the sum of its binary digits is odd.

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

Adding to 11110121021 its reverse (12012101111), we get a palindrome (23122222132).

The spelling of 11110121021 in words is "eleven billion, one hundred ten million, one hundred twenty-one thousand, twenty-one".