20010100020121 has 2 divisors, whose sum is σ = 20010100020122. Its totient is φ = 20010100020120.

The previous prime is 20010100020089. The next prime is 20010100020271. The reversal of 20010100020121 is 12102000101002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12180176780121 + 7829923240000 = 3490011^2 + 2798200^2 .

It is a cyclic number.

It is not a de Polignac number, because 20010100020121 - 2⁵ = 20010100020089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20010100020098 and 20010100020107.

It is not a weakly prime, because it can be changed into another prime (20010100027121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005050010060 + 10005050010061.

It is an arithmetic number, because the mean of its divisors is an integer number (10005050010061).

Almost surely, 2^{20010100020121} is an apocalyptic number.

It is an amenable number.

20010100020121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010100020121 is an equidigital number, since it uses as much as digits as its factorization.

20010100020121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20010100020121 its reverse (12102000101002), we get a palindrome (32112100121123).

The spelling of 20010100020121 in words is "twenty trillion, ten billion, one hundred million, twenty thousand, one hundred twenty-one".