111021121 has 2 divisors, whose sum is σ = 111021122. Its totient is φ = 111021120.

The previous prime is 111021083. The next prime is 111021151. The reversal of 111021121 is 121120111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110145025 + 876096 = 10495^2 + 936^2 .

It is a cyclic number.

It is not a de Polignac number, because 111021121 - 2⁷ = 111020993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111021098 and 111021107.

It is not a weakly prime, because it can be changed into another prime (111021151) 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, 55510560 + 55510561.

It is an arithmetic number, because the mean of its divisors is an integer number (55510561).

Almost surely, 2^111021121 is an apocalyptic number.

It is an amenable number.

111021121 is a deficient number, since it is larger than the sum of its proper divisors (1).

111021121 is an equidigital number, since it uses as much as digits as its factorization.

111021121 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 111021121 is about 10536.6560634767. The cubic root of 111021121 is about 480.6200335153.

Adding to 111021121 its reverse (121120111), we get a palindrome (232141232).

The spelling of 111021121 in words is "one hundred eleven million, twenty-one thousand, one hundred twenty-one".