111221011222221 has 32 divisors (see below), whose sum is σ = 148613499836928. Its totient is φ = 73988150512640.

The previous prime is 111221011222219. The next prime is 111221011222247. The reversal of 111221011222221 is 122222110122111.

It is a cyclic number.

It is not a de Polignac number, because 111221011222221 - 2¹ = 111221011222219 is a prime.

It is a super-2 number, since 2×111221011222221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221011222201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12706611781 + ... + 12706620533.

It is an arithmetic number, because the mean of its divisors is an integer number (4644171869904).

Almost surely, 2^{111221011222221} is an apocalyptic number.

It is an amenable number.

111221011222221 is a deficient number, since it is larger than the sum of its proper divisors (37392488614707).

111221011222221 is a wasteful number, since it uses less digits than its factorization.

111221011222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14021.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 111221011222221 its reverse (122222110122111), we get a palindrome (233443121344332).

The spelling of 111221011222221 in words is "one hundred eleven trillion, two hundred twenty-one billion, eleven million, two hundred twenty-two thousand, two hundred twenty-one".