111101221221 has 8 divisors (see below), whose sum is σ = 150929961120. Its totient is φ = 72669981072.

The previous prime is 111101221169. The next prime is 111101221223. The reversal of 111101221221 is 122122101111.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 111101221221 - 2⁷ = 111101221093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111101221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111101221223) 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 7 ways as a sum of consecutive naturals, for example, 349374751 + ... + 349375068.

It is an arithmetic number, because the mean of its divisors is an integer number (18866245140).

Almost surely, 2^111101221221 is an apocalyptic number.

It is an amenable number.

111101221221 is a deficient number, since it is larger than the sum of its proper divisors (39828739899).

111101221221 is an equidigital number, since it uses as much as digits as its factorization.

111101221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698749875.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 111101221221 its reverse (122122101111), we get a palindrome (233223322332).

The spelling of 111101221221 in words is "one hundred eleven billion, one hundred one million, two hundred twenty-one thousand, two hundred twenty-one".