111220131221 has 4 divisors (see below), whose sum is σ = 111250531200. Its totient is φ = 111189731244.

The previous prime is 111220131133. The next prime is 111220131229. The reversal of 111220131221 is 122131022111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111220131221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 111220131221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111220131229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15194501 + ... + 15201818.

It is an arithmetic number, because the mean of its divisors is an integer number (27812632800).

Almost surely, 2^111220131221 is an apocalyptic number.

It is an amenable number.

111220131221 is a deficient number, since it is larger than the sum of its proper divisors (30399979).

111220131221 is an equidigital number, since it uses as much as digits as its factorization.

111220131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30399978.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 111220131221 its reverse (122131022111), we get a palindrome (233351153332).

The spelling of 111220131221 in words is "one hundred eleven billion, two hundred twenty million, one hundred thirty-one thousand, two hundred twenty-one".