210225221 has 4 divisors (see below), whose sum is σ = 219365472. Its totient is φ = 201084972.

The previous prime is 210225217. The next prime is 210225227. The reversal of 210225221 is 122522012.

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 210225221 - 2² = 210225217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210225221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210225227) 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, 4570091 + ... + 4570136.

It is an arithmetic number, because the mean of its divisors is an integer number (54841368).

Almost surely, 2^210225221 is an apocalyptic number.

It is an amenable number.

210225221 is a deficient number, since it is larger than the sum of its proper divisors (9140251).

210225221 is an equidigital number, since it uses as much as digits as its factorization.

210225221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9140250.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 210225221 is about 14499.1455265474. The cubic root of 210225221 is about 594.6046107931.

Adding to 210225221 its reverse (122522012), we get a palindrome (332747233).

The spelling of 210225221 in words is "two hundred ten million, two hundred twenty-five thousand, two hundred twenty-one".