20202201221 has 4 divisors (see below), whose sum is σ = 20211828000. Its totient is φ = 20192574444.

The previous prime is 20202201163. The next prime is 20202201223. The reversal of 20202201221 is 12210220202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12210220202 = 2 ⋅6105110101.

It is a cyclic number.

It is not a de Polignac number, because 20202201221 - 2¹⁴ = 20202184837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20202201196 and 20202201205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202201223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4810241 + ... + 4814438.

It is an arithmetic number, because the mean of its divisors is an integer number (5052957000).

Almost surely, 2^20202201221 is an apocalyptic number.

It is an amenable number.

20202201221 is a deficient number, since it is larger than the sum of its proper divisors (9626779).

20202201221 is an equidigital number, since it uses as much as digits as its factorization.

20202201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9626778.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 20202201221 its reverse (12210220202), we get a palindrome (32412421423).

The spelling of 20202201221 in words is "twenty billion, two hundred two million, two hundred one thousand, two hundred twenty-one".