20021220010201 has 4 divisors (see below), whose sum is σ = 20398978878372. Its totient is φ = 19643461142032.

The previous prime is 20021220010163. The next prime is 20021220010217. The reversal of 20021220010201 is 10201002212002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5280987841600 + 14740232168601 = 2298040^2 + 3839301^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021220010201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20021220010801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188879434006 + ... + 188879434111.

It is an arithmetic number, because the mean of its divisors is an integer number (5099744719593).

Almost surely, 2^{20021220010201} is an apocalyptic number.

It is an amenable number.

20021220010201 is a deficient number, since it is larger than the sum of its proper divisors (377758868171).

20021220010201 is an equidigital number, since it uses as much as digits as its factorization.

20021220010201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377758868170.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20021220010201 its reverse (10201002212002), we get a palindrome (30222222222203).

The spelling of 20021220010201 in words is "twenty trillion, twenty-one billion, two hundred twenty million, ten thousand, two hundred one".