1121110021 has 2 divisors, whose sum is σ = 1121110022. Its totient is φ = 1121110020.

The previous prime is 1121110013. The next prime is 1121110031. The reversal of 1121110021 is 1200111211.

It is an a-pointer prime, because the next prime (1121110031) can be obtained adding 1121110021 to its sum of digits (10).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1090980900 + 30129121 = 33030^2 + 5489^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121110021 - 2³ = 1121110013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1121110031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560555010 + 560555011.

It is an arithmetic number, because the mean of its divisors is an integer number (560555011).

Almost surely, 2^1121110021 is an apocalyptic number.

It is an amenable number.

1121110021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121110021 is an equidigital number, since it uses as much as digits as its factorization.

1121110021 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 10.

The square root of 1121110021 is about 33482.9810650127. The cubic root of 1121110021 is about 1038.8417890846.

Adding to 1121110021 its reverse (1200111211), we get a palindrome (2321221232).

The spelling of 1121110021 in words is "one billion, one hundred twenty-one million, one hundred ten thousand, twenty-one".