111111020221 has 16 divisors (see below), whose sum is σ = 112996323328. Its totient is φ = 109245024000.

The previous prime is 111111020201. The next prime is 111111020231. The reversal of 111111020221 is 122020111111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 111111020221 - 2⁷ = 111111020093 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 (111111020201) 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, 8296951 + ... + 8310331.

It is an arithmetic number, because the mean of its divisors is an integer number (7062270208).

Almost surely, 2^111111020221 is an apocalyptic number.

It is an amenable number.

111111020221 is a deficient number, since it is larger than the sum of its proper divisors (1885303107).

111111020221 is a wasteful number, since it uses less digits than its factorization.

111111020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14092.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 111111020221 its reverse (122020111111), we get a palindrome (233131131332).

The spelling of 111111020221 in words is "one hundred eleven billion, one hundred eleven million, twenty thousand, two hundred twenty-one".