111221051 has 2 divisors, whose sum is σ = 111221052. Its totient is φ = 111221050.

The previous prime is 111221039. The next prime is 111221057. The reversal of 111221051 is 150122111.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111221051 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (111221057) 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, 55610525 + 55610526.

It is an arithmetic number, because the mean of its divisors is an integer number (55610526).

Almost surely, 2^111221051 is an apocalyptic number.

111221051 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221051 is an equidigital number, since it uses as much as digits as its factorization.

111221051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20, while the sum is 14.

The square root of 111221051 is about 10546.1391513672. The cubic root of 111221051 is about 480.9083652589.

Adding to 111221051 its reverse (150122111), we get a palindrome (261343162).

The spelling of 111221051 in words is "one hundred eleven million, two hundred twenty-one thousand, fifty-one".