111036721 has 2 divisors, whose sum is σ = 111036722. Its totient is φ = 111036720.

The previous prime is 111036713. The next prime is 111036769. The reversal of 111036721 is 127630111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107350321 + 3686400 = 10361^2 + 1920^2 .

It is a cyclic number.

It is not a de Polignac number, because 111036721 - 2³ = 111036713 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111036692 and 111036701.

It is not a weakly prime, because it can be changed into another prime (111036221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55518360 + 55518361.

It is an arithmetic number, because the mean of its divisors is an integer number (55518361).

Almost surely, 2^111036721 is an apocalyptic number.

It is an amenable number.

111036721 is a deficient number, since it is larger than the sum of its proper divisors (1).

111036721 is an equidigital number, since it uses as much as digits as its factorization.

111036721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 22.

The square root of 111036721 is about 10537.3963102846. The cubic root of 111036721 is about 480.6425437107.

Adding to 111036721 its reverse (127630111), we get a palindrome (238666832).

The spelling of 111036721 in words is "one hundred eleven million, thirty-six thousand, seven hundred twenty-one".