111200121021221 has 4 divisors (see below), whose sum is σ = 113084868835200. Its totient is φ = 109315373207244.

The previous prime is 111200121021191. The next prime is 111200121021299. The reversal of 111200121021221 is 122120121002111.

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 not a de Polignac number, because 111200121021221 - 2²⁶ = 111200053912357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 111200121021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111200121026221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 942373906901 + ... + 942373907018.

It is an arithmetic number, because the mean of its divisors is an integer number (28271217208800).

Almost surely, 2^{111200121021221} is an apocalyptic number.

It is an amenable number.

111200121021221 is a deficient number, since it is larger than the sum of its proper divisors (1884747813979).

111200121021221 is an equidigital number, since it uses as much as digits as its factorization.

111200121021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1884747813978.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 111200121021221 its reverse (122120121002111), we get a palindrome (233320242023332).

The spelling of 111200121021221 in words is "one hundred eleven trillion, two hundred billion, one hundred twenty-one million, twenty-one thousand, two hundred twenty-one".