212225015 has 4 divisors (see below), whose sum is σ = 254670024. Its totient is φ = 169780008.

The previous prime is 212224993. The next prime is 212225017. The reversal of 212225015 is 510522212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 212225015 - 2⁶ = 212224951 is a prime.

It is a super-4 number, since 4×212225015⁴ (a number of 34 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212225017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21222497 + ... + 21222506.

It is an arithmetic number, because the mean of its divisors is an integer number (63667506).

Almost surely, 2^212225015 is an apocalyptic number.

212225015 is a deficient number, since it is larger than the sum of its proper divisors (42445009).

212225015 is an equidigital number, since it uses as much as digits as its factorization.

212225015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42445008.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 212225015 is about 14567.9447761172. The cubic root of 212225015 is about 596.4840809505.

Adding to 212225015 its reverse (510522212), we get a palindrome (722747227).

The spelling of 212225015 in words is "two hundred twelve million, two hundred twenty-five thousand, fifteen".