10020121021 has 2 divisors, whose sum is σ = 10020121022. Its totient is φ = 10020121020.

The previous prime is 10020120973. The next prime is 10020121061. The reversal of 10020121021 is 12012102001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5665572900 + 4354548121 = 75270^2 + 65989^2 .

It is an emirp because it is prime and its reverse (12012102001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10020121021 - 2²³ = 10011732413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10020120989 and 10020121007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10020121061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5010060510 + 5010060511.

It is an arithmetic number, because the mean of its divisors is an integer number (5010060511).

Almost surely, 2^10020121021 is an apocalyptic number.

It is an amenable number.

10020121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10020121021 is an equidigital number, since it uses as much as digits as its factorization.

10020121021 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 10020121021 its reverse (12012102001), we get a palindrome (22032223022).

The spelling of 10020121021 in words is "ten billion, twenty million, one hundred twenty-one thousand, twenty-one".