221011110121 has 32 divisors (see below), whose sum is σ = 232550922240. Its totient is φ = 209849011200.

The previous prime is 221011110083. The next prime is 221011110161. The reversal of 221011110121 is 121011110122.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 221011110121 - 2³⁷ = 83572156649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221011110161) 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, 107651731 + ... + 107653783.

It is an arithmetic number, because the mean of its divisors is an integer number (7267216320).

Almost surely, 2^221011110121 is an apocalyptic number.

It is an amenable number.

221011110121 is a deficient number, since it is larger than the sum of its proper divisors (11539812119).

221011110121 is a wasteful number, since it uses less digits than its factorization.

221011110121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577.

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

Adding to 221011110121 its reverse (121011110122), we get a palindrome (342022220243).

Subtracting from 221011110121 its reverse (121011110122), we obtain a palindrome (99999999999).

The spelling of 221011110121 in words is "two hundred twenty-one billion, eleven million, one hundred ten thousand, one hundred twenty-one".