111201111021221 has 16 divisors (see below), whose sum is σ = 120121187592000. Its totient is φ = 102333363327360.

The previous prime is 111201111021211. The next prime is 111201111021223. The reversal of 111201111021221 is 122120111102111.

It is a cyclic number.

It is not a de Polignac number, because 111201111021221 - 2⁶ = 111201111021157 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 111201111021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111201111021223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122177801 + ... + 123084593.

It is an arithmetic number, because the mean of its divisors is an integer number (7507574224500).

Almost surely, 2^{111201111021221} is an apocalyptic number.

It is an amenable number.

111201111021221 is a deficient number, since it is larger than the sum of its proper divisors (8920076570779).

111201111021221 is a wasteful number, since it uses less digits than its factorization.

111201111021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 935636.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 111201111021221 its reverse (122120111102111), we get a palindrome (233321222123332).

The spelling of 111201111021221 in words is "one hundred eleven trillion, two hundred one billion, one hundred eleven million, twenty-one thousand, two hundred twenty-one".