221120020221 has 16 divisors (see below), whose sum is σ = 312501250368. Its totient is φ = 138594502400.

The previous prime is 221120020213. The next prime is 221120020243. The reversal of 221120020221 is 122020021122.

It is a cyclic number.

It is not a de Polignac number, because 221120020221 - 2³ = 221120020213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221120020221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221120020721) 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, 2255775 + ... + 2351756.

It is an arithmetic number, because the mean of its divisors is an integer number (19531328148).

Almost surely, 2^221120020221 is an apocalyptic number.

It is an amenable number.

221120020221 is a deficient number, since it is larger than the sum of its proper divisors (91381230147).

221120020221 is a wasteful number, since it uses less digits than its factorization.

221120020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4608492.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 221120020221 its reverse (122020021122), we get a palindrome (343140041343).

Subtracting from 221120020221 its reverse (122020021122), we obtain a palindrome (99099999099).

The spelling of 221120020221 in words is "two hundred twenty-one billion, one hundred twenty million, twenty thousand, two hundred twenty-one".