210020000221 has 4 divisors (see below), whose sum is σ = 214488510912. Its totient is φ = 205551489532.

The previous prime is 210020000171. The next prime is 210020000317. The reversal of 210020000221 is 122000020012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210020000221 - 2²⁹ = 209483129309 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210020000198 and 210020000207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210020004221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2234255275 + ... + 2234255368.

It is an arithmetic number, because the mean of its divisors is an integer number (53622127728).

Almost surely, 2^210020000221 is an apocalyptic number.

It is an amenable number.

210020000221 is a deficient number, since it is larger than the sum of its proper divisors (4468510691).

210020000221 is an equidigital number, since it uses as much as digits as its factorization.

210020000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4468510690.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 210020000221 its reverse (122000020012), we get a palindrome (332020020233).

The spelling of 210020000221 in words is "two hundred ten billion, twenty million, two hundred twenty-one", and thus it is an aban number.