210247225 has 6 divisors (see below), whose sum is σ = 260706590. Its totient is φ = 168197760.

The previous prime is 210247201. The next prime is 210247231. The reversal of 210247225 is 522742012.

It can be written as a sum of positive squares in 3 ways, for example, as 61089856 + 149157369 = 7816^2 + 12213^2 .

It is not a de Polignac number, because 210247225 - 2⁷ = 210247097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 8409889 = 210247225 / (2 + 1 + 0 + 2 + 4 + 7 + 2 + 2 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 210247225.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4204920 + ... + 4204969.

Almost surely, 2^210247225 is an apocalyptic number.

210247225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

210247225 is a deficient number, since it is larger than the sum of its proper divisors (50459365).

210247225 is an equidigital number, since it uses as much as digits as its factorization.

210247225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8409899 (or 8409894 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 210247225 is about 14499.9043100291. The cubic root of 210247225 is about 594.6253555660.

Adding to 210247225 its reverse (522742012), we get a palindrome (732989237).

The spelling of 210247225 in words is "two hundred ten million, two hundred forty-seven thousand, two hundred twenty-five".