111221310503 has 2 divisors, whose sum is σ = 111221310504. Its totient is φ = 111221310502.

The previous prime is 111221310481. The next prime is 111221310511. The reversal of 111221310503 is 305013122111.

It is a strong prime.

It is an emirp because it is prime and its reverse (305013122111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111221310503 - 2⁸ = 111221310247 is a prime.

It is a super-2 number, since 2×111221310503² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111221310803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610655251 + 55610655252.

It is an arithmetic number, because the mean of its divisors is an integer number (55610655252).

Almost surely, 2^111221310503 is an apocalyptic number.

111221310503 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221310503 is an equidigital number, since it uses as much as digits as its factorization.

111221310503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 20.

Adding to 111221310503 its reverse (305013122111), we get a palindrome (416234432614).

The spelling of 111221310503 in words is "one hundred eleven billion, two hundred twenty-one million, three hundred ten thousand, five hundred three".