221122121221111 has 8 divisors (see below), whose sum is σ = 241224324307344. Its totient is φ = 201019950145920.

The previous prime is 221122121220997. The next prime is 221122121221171. The reversal of 221122121221111 is 111122121221122.

221122121221111 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221122121221111 - 2¹¹ = 221122121219063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221122121221171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7796785 + ... + 22428421.

It is an arithmetic number, because the mean of its divisors is an integer number (30153040538418).

Almost surely, 2^{221122121221111} is an apocalyptic number.

221122121221111 is a deficient number, since it is larger than the sum of its proper divisors (20102203086233).

221122121221111 is a wasteful number, since it uses less digits than its factorization.

221122121221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16005521.

The product of its digits is 128, while the sum is 22.

Adding to 221122121221111 its reverse (111122121221122), we get a palindrome (332244242442233).

The spelling of 221122121221111 in words is "two hundred twenty-one trillion, one hundred twenty-two billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred eleven".