20221021000121 has 2 divisors, whose sum is σ = 20221021000122. Its totient is φ = 20221021000120.

The previous prime is 20221021000111. The next prime is 20221021000133. The reversal of 20221021000121 is 12100012012202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17947593331600 + 2273427668521 = 4236460^2 + 1507789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20221021000121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20221021000096 and 20221021000105.

It is not a weakly prime, because it can be changed into another prime (20221021000111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110510500060 + 10110510500061.

It is an arithmetic number, because the mean of its divisors is an integer number (10110510500061).

Almost surely, 2^{20221021000121} is an apocalyptic number.

It is an amenable number.

20221021000121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20221021000121 is an equidigital number, since it uses as much as digits as its factorization.

20221021000121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20221021000121 its reverse (12100012012202), we get a palindrome (32321033012323).

The spelling of 20221021000121 in words is "twenty trillion, two hundred twenty-one billion, twenty-one million, one hundred twenty-one", and thus it is an aban number.