111222111230021 has 6 divisors (see below), whose sum is σ = 122252403252966. Its totient is φ = 101111010209000.

The previous prime is 111222111230003. The next prime is 111222111230089. The reversal of 111222111230021 is 120032111222111.

It can be written as a sum of positive squares in only one way, i.e., 92043185839396 + 19178925390625 = 9593914^2 + 4379375^2 .

It is a de Polignac number, because none of the positive numbers 2^k-111222111230021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111222111229975 and 111222111230002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111222111230921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 459595500830 + ... + 459595501071.

It is an arithmetic number, because the mean of its divisors is an integer number (20375400542161).

Almost surely, 2^{111222111230021} is an apocalyptic number.

111222111230021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111222111230021 is a deficient number, since it is larger than the sum of its proper divisors (11030292022945).

111222111230021 is an equidigital number, since it uses as much as digits as its factorization.

111222111230021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919191001923 (or 919191001912 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 20.

Adding to 111222111230021 its reverse (120032111222111), we get a palindrome (231254222452132).

The spelling of 111222111230021 in words is "one hundred eleven trillion, two hundred twenty-two billion, one hundred eleven million, two hundred thirty thousand, twenty-one".