210221320021 has 8 divisors (see below), whose sum is σ = 214955656704. Its totient is φ = 205497881040.

The previous prime is 210221320013. The next prime is 210221320033. The reversal of 210221320021 is 120023122012.

It is a happy number.

210221320021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210221320021 - 2³ = 210221320013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210221319977 and 210221320004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221320091) 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 in 7 ways as a sum of consecutive naturals, for example, 2685405 + ... + 2762578.

It is an arithmetic number, because the mean of its divisors is an integer number (26869457088).

Almost surely, 2^210221320021 is an apocalyptic number.

It is an amenable number.

210221320021 is a deficient number, since it is larger than the sum of its proper divisors (4734336683).

210221320021 is an equidigital number, since it uses as much as digits as its factorization.

210221320021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5448851.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 210221320021 its reverse (120023122012), we get a palindrome (330244442033).

The spelling of 210221320021 in words is "two hundred ten billion, two hundred twenty-one million, three hundred twenty thousand, twenty-one".