20020020201221 has 4 divisors (see below), whose sum is σ = 20020278558252. Its totient is φ = 20019761844192.

The previous prime is 20020020201197. The next prime is 20020020201241. The reversal of 20020020201221 is 12210202002002.

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 17304676492321 + 2715343708900 = 4159889^2 + 1647830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20020020201221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20020020201196 and 20020020201205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020020201241) 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, 129062246 + ... + 129217271.

It is an arithmetic number, because the mean of its divisors is an integer number (5005069639563).

Almost surely, 2^{20020020201221} is an apocalyptic number.

It is an amenable number.

20020020201221 is a deficient number, since it is larger than the sum of its proper divisors (258357031).

20020020201221 is an equidigital number, since it uses as much as digits as its factorization.

20020020201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258357030.

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

Adding to 20020020201221 its reverse (12210202002002), we get a palindrome (32230222203223).

The spelling of 20020020201221 in words is "twenty trillion, twenty billion, twenty million, two hundred one thousand, two hundred twenty-one".