210221002021 has 2 divisors, whose sum is σ = 210221002022. Its totient is φ = 210221002020.

The previous prime is 210221002009. The next prime is 210221002067. The reversal of 210221002021 is 120200122012.

It is a happy number.

210221002021 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., 185038485921 + 25182516100 = 430161^2 + 158690^2 .

It is a cyclic number.

It is not a de Polignac number, because 210221002021 - 2⁹ = 210221001509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210221001992 and 210221002010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210221002081) 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, 105110501010 + 105110501011.

It is an arithmetic number, because the mean of its divisors is an integer number (105110501011).

Almost surely, 2^210221002021 is an apocalyptic number.

It is an amenable number.

210221002021 is a deficient number, since it is larger than the sum of its proper divisors (1).

210221002021 is an equidigital number, since it uses as much as digits as its factorization.

210221002021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 210221002021 its reverse (120200122012), we get a palindrome (330421124033).

The spelling of 210221002021 in words is "two hundred ten billion, two hundred twenty-one million, two thousand, twenty-one".