111001222021221 has 24 divisors (see below), whose sum is σ = 183257898736640. Its totient is φ = 63423112967136.

The previous prime is 111001222021187. The next prime is 111001222021231. The reversal of 111001222021221 is 122120222100111.

It is not a de Polignac number, because 111001222021221 - 2¹⁹ = 111001221496933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111001222021194 and 111001222021203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111001222021231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84856306 + ... + 86154483.

Almost surely, 2^{111001222021221} is an apocalyptic number.

It is an amenable number.

111001222021221 is a deficient number, since it is larger than the sum of its proper divisors (72256676715419).

111001222021221 is a wasteful number, since it uses less digits than its factorization.

111001222021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171021105 (or 171021102 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 111001222021221 its reverse (122120222100111), we get a palindrome (233121444121332).

The spelling of 111001222021221 in words is "one hundred eleven trillion, one billion, two hundred twenty-two million, twenty-one thousand, two hundred twenty-one".