201221020221 has 32 divisors (see below), whose sum is σ = 291137616000. Its totient is φ = 122884155648.

The previous prime is 201221020213. The next prime is 201221020237. The reversal of 201221020221 is 122020122102.

It is not a de Polignac number, because 201221020221 - 2³ = 201221020213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201221020221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221020291) 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, 15112515 + ... + 15125823.

It is an arithmetic number, because the mean of its divisors is an integer number (9098050500).

Almost surely, 2^201221020221 is an apocalyptic number.

It is an amenable number.

201221020221 is a deficient number, since it is larger than the sum of its proper divisors (89916595779).

201221020221 is a wasteful number, since it uses less digits than its factorization.

201221020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16253.

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

Adding to 201221020221 its reverse (122020122102), we get a palindrome (323241142323).

The spelling of 201221020221 in words is "two hundred one billion, two hundred twenty-one million, twenty thousand, two hundred twenty-one".