200120020100921 has 2 divisors, whose sum is σ = 200120020100922. Its totient is φ = 200120020100920.

The previous prime is 200120020100909. The next prime is 200120020100927. The reversal of 200120020100921 is 129001020021002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184025801803321 + 16094218297600 = 13565611^2 + 4011760^2 .

It is a cyclic number.

It is not a de Polignac number, because 200120020100921 - 2⁶ = 200120020100857 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 200120020100893 and 200120020100902.

It is not a weakly prime, because it can be changed into another prime (200120020100927) 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 as a sum of consecutive naturals, namely, 100060010050460 + 100060010050461.

It is an arithmetic number, because the mean of its divisors is an integer number (100060010050461).

Almost surely, 2^{200120020100921} is an apocalyptic number.

It is an amenable number.

200120020100921 is a deficient number, since it is larger than the sum of its proper divisors (1).

200120020100921 is an equidigital number, since it uses as much as digits as its factorization.

200120020100921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 200120020100921 its reverse (129001020021002), we get a palindrome (329121040121923).

The spelling of 200120020100921 in words is "two hundred trillion, one hundred twenty billion, twenty million, one hundred thousand, nine hundred twenty-one".