20020120221 has 4 divisors (see below), whose sum is σ = 26693493632. Its totient is φ = 13346746812.

The previous prime is 20020120177. The next prime is 20020120243. The reversal of 20020120221 is 12202102002.

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.

It is not a de Polignac number, because 20020120221 - 2⁶ = 20020120157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20020120197 and 20020120206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20020120721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3336686701 + ... + 3336686706.

It is an arithmetic number, because the mean of its divisors is an integer number (6673373408).

Almost surely, 2^20020120221 is an apocalyptic number.

It is an amenable number.

20020120221 is a deficient number, since it is larger than the sum of its proper divisors (6673373411).

20020120221 is an equidigital number, since it uses as much as digits as its factorization.

20020120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6673373410.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20020120221 its reverse (12202102002), we get a palindrome (32222222223).

The spelling of 20020120221 in words is "twenty billion, twenty million, one hundred twenty thousand, two hundred twenty-one".