111423721 has 2 divisors, whose sum is σ = 111423722. Its totient is φ = 111423720.

The previous prime is 111423677. The next prime is 111423737. The reversal of 111423721 is 127324111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103938025 + 7485696 = 10195^2 + 2736^2 .

It is a cyclic number.

It is not a de Polignac number, because 111423721 - 2¹³ = 111415529 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111423692 and 111423701.

It is not a weakly prime, because it can be changed into another prime (111423751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55711860 + 55711861.

It is an arithmetic number, because the mean of its divisors is an integer number (55711861).

Almost surely, 2^111423721 is an apocalyptic number.

It is an amenable number.

111423721 is a deficient number, since it is larger than the sum of its proper divisors (1).

111423721 is an equidigital number, since it uses as much as digits as its factorization.

111423721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 22.

The square root of 111423721 is about 10555.7435076834. The cubic root of 111423721 is about 481.2002960755.

Adding to 111423721 its reverse (127324111), we get a palindrome (238747832).

The spelling of 111423721 in words is "one hundred eleven million, four hundred twenty-three thousand, seven hundred twenty-one".