210220221 has 4 divisors (see below), whose sum is σ = 280293632. Its totient is φ = 140146812.

The previous prime is 210220193. The next prime is 210220229. The reversal of 210220221 is 122022012.

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 not a de Polignac number, because 210220221 - 2¹⁰ = 210219197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210220197 and 210220206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210220229) 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, 35036701 + ... + 35036706.

It is an arithmetic number, because the mean of its divisors is an integer number (70073408).

Almost surely, 2^210220221 is an apocalyptic number.

It is an amenable number.

210220221 is a deficient number, since it is larger than the sum of its proper divisors (70073411).

210220221 is an equidigital number, since it uses as much as digits as its factorization.

210220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70073410.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 210220221 is about 14498.9731015683. The cubic root of 210220221 is about 594.5998967272.

Adding to 210220221 its reverse (122022012), we get a palindrome (332242233).

The spelling of 210220221 in words is "two hundred ten million, two hundred twenty thousand, two hundred twenty-one".