20010210121021 has 2 divisors, whose sum is σ = 20010210121022. Its totient is φ = 20010210121020.

The previous prime is 20010210121019. The next prime is 20010210121103. The reversal of 20010210121021 is 12012101201002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18820725417796 + 1189484703225 = 4338286^2 + 1090635^2 .

It is a cyclic number.

It is not a de Polignac number, because 20010210121021 - 2¹ = 20010210121019 is a prime.

It is a super-2 number, since 2×20010210121021² (a number of 27 digits) contains 22 as substring.

Together with 20010210121019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20010210120992 and 20010210121010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20010210421021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005105060510 + 10005105060511.

It is an arithmetic number, because the mean of its divisors is an integer number (10005105060511).

Almost surely, 2^{20010210121021} is an apocalyptic number.

It is an amenable number.

20010210121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010210121021 is an equidigital number, since it uses as much as digits as its factorization.

20010210121021 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 13.

Adding to 20010210121021 its reverse (12012101201002), we get a palindrome (32022311322023).

The spelling of 20010210121021 in words is "twenty trillion, ten billion, two hundred ten million, one hundred twenty-one thousand, twenty-one".