200120010121021 has 4 divisors (see below), whose sum is σ = 200217486991132. Its totient is φ = 200022533250912.

The previous prime is 200120010121013. The next prime is 200120010121033. The reversal of 200120010121021 is 120121010021002.

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 94361698860025 + 105758311260996 = 9713995^2 + 10283886^2 .

It is a cyclic number.

It is not a de Polignac number, because 200120010121021 - 2³ = 200120010121013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200120010120992 and 200120010121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200120010121321) 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, 48738431976 + ... + 48738436081.

It is an arithmetic number, because the mean of its divisors is an integer number (50054371747783).

Almost surely, 2^{200120010121021} is an apocalyptic number.

It is an amenable number.

200120010121021 is a deficient number, since it is larger than the sum of its proper divisors (97476870111).

200120010121021 is an equidigital number, since it uses as much as digits as its factorization.

200120010121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97476870110.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 200120010121021 its reverse (120121010021002), we get a palindrome (320241020142023).

The spelling of 200120010121021 in words is "two hundred trillion, one hundred twenty billion, ten million, one hundred twenty-one thousand, twenty-one".