210020119921 has 2 divisors, whose sum is σ = 210020119922. Its totient is φ = 210020119920.

The previous prime is 210020119889. The next prime is 210020120027. The reversal of 210020119921 is 129911020012.

210020119921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204969885696 + 5050234225 = 452736^2 + 71065^2 .

It is a cyclic number.

It is not a de Polignac number, because 210020119921 - 2⁵ = 210020119889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210020119921.

It is not a weakly prime, because it can be changed into another prime (210020119321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105010059960 + 105010059961.

It is an arithmetic number, because the mean of its divisors is an integer number (105010059961).

Almost surely, 2^210020119921 is an apocalyptic number.

It is an amenable number.

210020119921 is a deficient number, since it is larger than the sum of its proper divisors (1).

210020119921 is an equidigital number, since it uses as much as digits as its factorization.

210020119921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 28.

Adding to 210020119921 its reverse (129911020012), we get a palindrome (339931139933).

The spelling of 210020119921 in words is "two hundred ten billion, twenty million, one hundred nineteen thousand, nine hundred twenty-one".