20010010121021 has 2 divisors, whose sum is σ = 20010010121022. Its totient is φ = 20010010121020.

The previous prime is 20010010120949. The next prime is 20010010121027. The reversal of 20010010121021 is 12012101001002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15487097683225 + 4522912437796 = 3935365^2 + 2126714^2 .

It is a cyclic number.

It is not a de Polignac number, because 20010010121021 - 2¹⁸ = 20010009858877 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20010010120993 and 20010010121011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20010010121027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005005060510 + 10005005060511.

It is an arithmetic number, because the mean of its divisors is an integer number (10005005060511).

Almost surely, 2^{20010010121021} is an apocalyptic number.

It is an amenable number.

20010010121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010010121021 is an equidigital number, since it uses as much as digits as its factorization.

20010010121021 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 11.

Adding to 20010010121021 its reverse (12012101001002), we get a palindrome (32022111122023).

The spelling of 20010010121021 in words is "twenty trillion, ten billion, ten million, one hundred twenty-one thousand, twenty-one".