111210221011221 has 12 divisors (see below), whose sum is σ = 160638134567820. Its totient is φ = 74139617188800.

The previous prime is 111210221011217. The next prime is 111210221011291. The reversal of 111210221011221 is 122110122012111.

It is a happy number.

111210221011221 is a `hidden beast` number, since 1 + 1 + 1 + 210 + 221 + 0 + 11 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 82040824254321 + 29169396756900 = 9057639^2 + 5400870^2 .

It is not a de Polignac number, because 111210221011221 - 2² = 111210221011217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111210221011194 and 111210221011203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111210221011291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42848680 + ... + 45369921.

It is an arithmetic number, because the mean of its divisors is an integer number (13386511213985).

Almost surely, 2^{111210221011221} is an apocalyptic number.

It is an amenable number.

111210221011221 is a deficient number, since it is larger than the sum of its proper divisors (49427913556599).

111210221011221 is a wasteful number, since it uses less digits than its factorization.

111210221011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88358676 (or 88358673 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 111210221011221 its reverse (122110122012111), we get a palindrome (233320343023332).

The spelling of 111210221011221 in words is "one hundred eleven trillion, two hundred ten billion, two hundred twenty-one million, eleven thousand, two hundred twenty-one".