20020121210221 has 48 divisors (see below), whose sum is σ = 23267605915008. Its totient is φ = 17070307027200.

The previous prime is 20020121210207. The next prime is 20020121210227. The reversal of 20020121210221 is 12201212102002.

It is a happy number.

It is not a de Polignac number, because 20020121210221 - 2⁹ = 20020121209709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20020121210195 and 20020121210204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020121210227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 215936751 + ... + 216029443.

It is an arithmetic number, because the mean of its divisors is an integer number (484741789896).

Almost surely, 2^{20020121210221} is an apocalyptic number.

It is an amenable number.

20020121210221 is a deficient number, since it is larger than the sum of its proper divisors (3247484704787).

20020121210221 is a wasteful number, since it uses less digits than its factorization.

20020121210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93430 (or 93401 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20020121210221 its reverse (12201212102002), we get a palindrome (32221333312223).

The spelling of 20020121210221 in words is "twenty trillion, twenty billion, one hundred twenty-one million, two hundred ten thousand, two hundred twenty-one".