20210120010961 has 2 divisors, whose sum is σ = 20210120010962. Its totient is φ = 20210120010960.

The previous prime is 20210120010959. The next prime is 20210120011019. The reversal of 20210120010961 is 16901002101202.

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., 20008086841600 + 202033169361 = 4473040^2 + 449481^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210120010961 - 2¹ = 20210120010959 is a prime.

Together with 20210120010959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (20210120010361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105060005480 + 10105060005481.

It is an arithmetic number, because the mean of its divisors is an integer number (10105060005481).

Almost surely, 2^{20210120010961} is an apocalyptic number.

It is an amenable number.

20210120010961 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210120010961 is an equidigital number, since it uses as much as digits as its factorization.

20210120010961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 20210120010961 in words is "twenty trillion, two hundred ten billion, one hundred twenty million, ten thousand, nine hundred sixty-one".