111221022211021 has 16 divisors (see below), whose sum is σ = 115848681580800. Its totient is φ = 106647745196608.

The previous prime is 111221022210997. The next prime is 111221022211031. The reversal of 111221022211021 is 120112220122111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 111221022211021 - 2¹⁷ = 111221022079949 is a prime.

It is a super-2 number, since 2×111221022211021² (a number of 29 digits) contains 22 as substring.

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 111221022211021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221022211031) 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, 9846181 + ... + 17871466.

It is an arithmetic number, because the mean of its divisors is an integer number (7240542598800).

Almost surely, 2^{111221022211021} is an apocalyptic number.

It is an amenable number.

111221022211021 is a deficient number, since it is larger than the sum of its proper divisors (4627659369779).

111221022211021 is a wasteful number, since it uses less digits than its factorization.

111221022211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27718628.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 111221022211021 its reverse (120112220122111), we get a palindrome (231333242333132).

The spelling of 111221022211021 in words is "one hundred eleven trillion, two hundred twenty-one billion, twenty-two million, two hundred eleven thousand, twenty-one".