111221871031 has 2 divisors, whose sum is σ = 111221871032. Its totient is φ = 111221871030.

The previous prime is 111221871023. The next prime is 111221871037. The reversal of 111221871031 is 130178122111.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111221871031 - 2³ = 111221871023 is a prime.

It is a super-2 number, since 2×111221871031² (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 (111221871037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55610935515 + 55610935516.

It is an arithmetic number, because the mean of its divisors is an integer number (55610935516).

Almost surely, 2^111221871031 is an apocalyptic number.

111221871031 is a deficient number, since it is larger than the sum of its proper divisors (1).

111221871031 is an equidigital number, since it uses as much as digits as its factorization.

111221871031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 28.

Adding to 111221871031 its reverse (130178122111), we get a palindrome (241399993142).

The spelling of 111221871031 in words is "one hundred eleven billion, two hundred twenty-one million, eight hundred seventy-one thousand, thirty-one".