212101000120021 has 2 divisors, whose sum is σ = 212101000120022. Its totient is φ = 212101000120020.

The previous prime is 212101000120013. The next prime is 212101000120057. The reversal of 212101000120021 is 120021000101212.

212101000120021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140847311503921 + 71253688616100 = 11867911^2 + 8441190^2 .

It is a cyclic number.

It is not a de Polignac number, because 212101000120021 - 2³ = 212101000120013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212101000119983 and 212101000120010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212101000120921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106050500060010 + 106050500060011.

It is an arithmetic number, because the mean of its divisors is an integer number (106050500060011).

Almost surely, 2^{212101000120021} is an apocalyptic number.

It is an amenable number.

212101000120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

212101000120021 is an equidigital number, since it uses as much as digits as its factorization.

212101000120021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 212101000120021 its reverse (120021000101212), we get a palindrome (332122000221233).

The spelling of 212101000120021 in words is "two hundred twelve trillion, one hundred one billion, one hundred twenty thousand, twenty-one".