212210245 has 8 divisors (see below), whose sum is σ = 274241016. Its totient is φ = 156709056.

The previous prime is 212210237. The next prime is 212210249. The reversal of 212210245 is 542012212.

It can be written as a sum of positive squares in 4 ways, for example, as 13089924 + 199120321 = 3618^2 + 14111^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212210245 - 2³ = 212210237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212210249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1632322 + ... + 1632451.

It is an arithmetic number, because the mean of its divisors is an integer number (34280127).

Almost surely, 2^212210245 is an apocalyptic number.

It is an amenable number.

212210245 is a deficient number, since it is larger than the sum of its proper divisors (62030771).

212210245 is a wasteful number, since it uses less digits than its factorization.

212210245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3264791.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 212210245 is about 14567.4378323712. The cubic root of 212210245 is about 596.4702430055.

Adding to 212210245 its reverse (542012212), we get a palindrome (754222457).

The spelling of 212210245 in words is "two hundred twelve million, two hundred ten thousand, two hundred forty-five".