201020221221 has 8 divisors (see below), whose sum is σ = 268375504320. Its totient is φ = 133839209472.

The previous prime is 201020221189. The next prime is 201020221229. The reversal of 201020221221 is 122122020102.

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

It is not a de Polignac number, because 201020221221 - 2⁵ = 201020221189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201020221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201020221229) 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, 43565145 + ... + 43569758.

It is an arithmetic number, because the mean of its divisors is an integer number (33546938040).

Almost surely, 2^201020221221 is an apocalyptic number.

It is an amenable number.

201020221221 is a deficient number, since it is larger than the sum of its proper divisors (67355283099).

201020221221 is an equidigital number, since it uses as much as digits as its factorization.

201020221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87135675.

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

Adding to 201020221221 its reverse (122122020102), we get a palindrome (323142241323).

The spelling of 201020221221 in words is "two hundred one billion, twenty million, two hundred twenty-one thousand, two hundred twenty-one".