111221001247 has 2 divisors, whose sum is σ = 111221001248. Its totient is φ = 111221001246.

The previous prime is 111221001239. The next prime is 111221001251. The reversal of 111221001247 is 742100122111.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111221001247 - 2³ = 111221001239 is a prime.

It is a super-2 number, since 2×111221001247² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111221008247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610500623 + 55610500624.

It is an arithmetic number, because the mean of its divisors is an integer number (55610500624).

Almost surely, 2^111221001247 is an apocalyptic number.

111221001247 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221001247 is an equidigital number, since it uses as much as digits as its factorization.

111221001247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 111221001247 its reverse (742100122111), we get a palindrome (853321123358).

The spelling of 111221001247 in words is "one hundred eleven billion, two hundred twenty-one million, one thousand, two hundred forty-seven".