210212225 has 12 divisors (see below), whose sum is σ = 275996844. Its totient is φ = 158277120.

The previous prime is 210212201. The next prime is 210212227. The reversal of 210212225 is 522212012.

It can be written as a sum of positive squares in 6 ways, for example, as 13315201 + 196897024 = 3649^2 + 14032^2 .

It is not a de Polignac number, because 210212225 - 2¹⁰ = 210211201 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210212227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 246884 + ... + 247733.

It is an arithmetic number, because the mean of its divisors is an integer number (22999737).

Almost surely, 2^210212225 is an apocalyptic number.

210212225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

210212225 is a deficient number, since it is larger than the sum of its proper divisors (65784619).

210212225 is a wasteful number, since it uses less digits than its factorization.

210212225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494644 (or 494639 counting only the distinct ones).

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

The square root of 210212225 is about 14498.6973552799. The cubic root of 210212225 is about 594.5923578377.

Adding to 210212225 its reverse (522212012), we get a palindrome (732424237).

The spelling of 210212225 in words is "two hundred ten million, two hundred twelve thousand, two hundred twenty-five".