1110121021 has 2 divisors, whose sum is σ = 1110121022. Its totient is φ = 1110121020.

The previous prime is 1110120959. The next prime is 1110121039. The reversal of 1110121021 is 1201210111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1065043225 + 45077796 = 32635^2 + 6714^2 .

It is a cyclic number.

It is not a de Polignac number, because 1110121021 - 2¹⁷ = 1109989949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1110120989 and 1110121007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1110121081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555060510 + 555060511.

It is an arithmetic number, because the mean of its divisors is an integer number (555060511).

Almost surely, 2^1110121021 is an apocalyptic number.

It is an amenable number.

1110121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1110121021 is an equidigital number, since it uses as much as digits as its factorization.

1110121021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1110121021 is about 33318.4786717521. The cubic root of 1110121021 is about 1035.4364332097.

Adding to 1110121021 its reverse (1201210111), we get a palindrome (2311331132).

The spelling of 1110121021 in words is "one billion, one hundred ten million, one hundred twenty-one thousand, twenty-one".