20210011121021 has 2 divisors, whose sum is σ = 20210011121022. Its totient is φ = 20210011121020.

The previous prime is 20210011121009. The next prime is 20210011121051. The reversal of 20210011121021 is 12012111001202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16384118152900 + 3825892968121 = 4047730^2 + 1955989^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210011121021 - 2¹⁰ = 20210011119997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20210011120987 and 20210011121005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20210011121051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105005560510 + 10105005560511.

It is an arithmetic number, because the mean of its divisors is an integer number (10105005560511).

Almost surely, 2^{20210011121021} is an apocalyptic number.

It is an amenable number.

20210011121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210011121021 is an equidigital number, since it uses as much as digits as its factorization.

20210011121021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20210011121021 its reverse (12012111001202), we get a palindrome (32222122122223).

The spelling of 20210011121021 in words is "twenty trillion, two hundred ten billion, eleven million, one hundred twenty-one thousand, twenty-one".