111421243 has 2 divisors, whose sum is σ = 111421244. Its totient is φ = 111421242.

The previous prime is 111421183. The next prime is 111421253. The reversal of 111421243 is 342124111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111421243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111421243.

It is not a weakly prime, because it can be changed into another prime (111421253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55710621 + 55710622.

It is an arithmetic number, because the mean of its divisors is an integer number (55710622).

Almost surely, 2^111421243 is an apocalyptic number.

111421243 is a deficient number, since it is larger than the sum of its proper divisors (1).

111421243 is an equidigital number, since it uses as much as digits as its factorization.

111421243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 19.

The square root of 111421243 is about 10555.6261301734. The cubic root of 111421243 is about 481.1967288423.

Adding to 111421243 its reverse (342124111), we get a palindrome (453545354).

The spelling of 111421243 in words is "one hundred eleven million, four hundred twenty-one thousand, two hundred forty-three".