111131210221 has 4 divisors (see below), whose sum is σ = 117668340252. Its totient is φ = 104594080192.

The previous prime is 111131210117. The next prime is 111131210231. The reversal of 111131210221 is 122012131111.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37114022500 + 74017187721 = 192650^2 + 272061^2 .

It is a cyclic number.

It is not a de Polignac number, because 111131210221 - 2⁷ = 111131210093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111131210195 and 111131210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111131210231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3268564990 + ... + 3268565023.

It is an arithmetic number, because the mean of its divisors is an integer number (29417085063).

Almost surely, 2^111131210221 is an apocalyptic number.

It is an amenable number.

111131210221 is a deficient number, since it is larger than the sum of its proper divisors (6537130031).

111131210221 is an equidigital number, since it uses as much as digits as its factorization.

111131210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6537130030.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 111131210221 its reverse (122012131111), we get a palindrome (233143341332).

The spelling of 111131210221 in words is "one hundred eleven billion, one hundred thirty-one million, two hundred ten thousand, two hundred twenty-one".