20002200121 has 4 divisors (see below), whose sum is σ = 20085197044. Its totient is φ = 19919203200.

The previous prime is 20002200077. The next prime is 20002200149. The reversal of 20002200121 is 12100220002.

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 10000000000 + 10002200121 = 100000^2 + 100011^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002200121 - 2⁷ = 20002199993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20002200098 and 20002200107.

It is not an unprimeable number, because it can be changed into a prime (20002200191) 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, 41498100 + ... + 41498581.

It is an arithmetic number, because the mean of its divisors is an integer number (5021299261).

Almost surely, 2^20002200121 is an apocalyptic number.

It is an amenable number.

20002200121 is a deficient number, since it is larger than the sum of its proper divisors (82996923).

20002200121 is an equidigital number, since it uses as much as digits as its factorization.

20002200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82996922.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20002200121 its reverse (12100220002), we get a palindrome (32102420123).

The spelling of 20002200121 in words is "twenty billion, two million, two hundred thousand, one hundred twenty-one".