111004021 has 2 divisors, whose sum is σ = 111004022. Its totient is φ = 111004020.

The previous prime is 111004013. The next prime is 111004037. The reversal of 111004021 is 120400111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94284100 + 16719921 = 9710^2 + 4089^2 .

It is a cyclic number.

It is not a de Polignac number, because 111004021 - 2³ = 111004013 is a prime.

It is a super-3 number, since 3×111004021³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111003989 and 111004007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111004001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55502010 + 55502011.

It is an arithmetic number, because the mean of its divisors is an integer number (55502011).

Almost surely, 2^111004021 is an apocalyptic number.

It is an amenable number.

111004021 is a deficient number, since it is larger than the sum of its proper divisors (1).

111004021 is an equidigital number, since it uses as much as digits as its factorization.

111004021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 111004021 is about 10535.8445793396. The cubic root of 111004021 is about 480.5953564554.

Adding to 111004021 its reverse (120400111), we get a palindrome (231404132).

The spelling of 111004021 in words is "one hundred eleven million, four thousand, twenty-one".