212405215 has 24 divisors (see below), whose sum is σ = 287031024. Its totient is φ = 150691200.

The previous prime is 212405213. The next prime is 212405231. The reversal of 212405215 is 512504212.

It is not a de Polignac number, because 212405215 - 2¹ = 212405213 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212405213) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20524 + ... + 29086.

It is an arithmetic number, because the mean of its divisors is an integer number (11959626).

Almost surely, 2^212405215 is an apocalyptic number.

212405215 is a deficient number, since it is larger than the sum of its proper divisors (74625809).

212405215 is a wasteful number, since it uses less digits than its factorization.

212405215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8631 (or 8620 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 212405215 is about 14574.1282758181. The cubic root of 212405215 is about 596.6528578240.

Adding to 212405215 its reverse (512504212), we get a palindrome (724909427).

The spelling of 212405215 in words is "two hundred twelve million, four hundred five thousand, two hundred fifteen".