201020212221 has 32 divisors (see below), whose sum is σ = 280399553280. Its totient is φ = 127857590784.

The previous prime is 201020212199. The next prime is 201020212223. The reversal of 201020212221 is 122212020102.

It is not a de Polignac number, because 201020212221 - 2⁹ = 201020211709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201020212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201020212223) 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, 72074695 + ... + 72077483.

It is an arithmetic number, because the mean of its divisors is an integer number (8762486040).

Almost surely, 2^201020212221 is an apocalyptic number.

It is an amenable number.

201020212221 is a deficient number, since it is larger than the sum of its proper divisors (79379341059).

201020212221 is a wasteful number, since it uses less digits than its factorization.

201020212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5125.

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

Adding to 201020212221 its reverse (122212020102), we get a palindrome (323232232323).

The spelling of 201020212221 in words is "two hundred one billion, twenty million, two hundred twelve thousand, two hundred twenty-one".