20210000020121 has 2 divisors, whose sum is σ = 20210000020122. Its totient is φ = 20210000020120.

The previous prime is 20210000020057. The next prime is 20210000020207. The reversal of 20210000020121 is 12102000001202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15862608218521 + 4347391801600 = 3982789^2 + 2085040^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210000020121 - 2⁶ = 20210000020057 is a prime.

It is not a weakly prime, because it can be changed into another prime (20210000020921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105000010060 + 10105000010061.

It is an arithmetic number, because the mean of its divisors is an integer number (10105000010061).

Almost surely, 2^{20210000020121} is an apocalyptic number.

It is an amenable number.

20210000020121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210000020121 is an equidigital number, since it uses as much as digits as its factorization.

20210000020121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20210000020121 its reverse (12102000001202), we get a palindrome (32312000021323).

The spelling of 20210000020121 in words is "twenty trillion, two hundred ten billion, twenty thousand, one hundred twenty-one".