212221215 has 40 divisors (see below), whose sum is σ = 388555200. Its totient is φ = 110766528.

The previous prime is 212221181. The next prime is 212221223. The reversal of 212221215 is 512122212.

It is not a de Polignac number, because 212221215 - 2¹⁰ = 212220191 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 13461 + ... + 24609.

It is an arithmetic number, because the mean of its divisors is an integer number (9713880).

Almost surely, 2^212221215 is an apocalyptic number.

212221215 is a deficient number, since it is larger than the sum of its proper divisors (176333985).

212221215 is a wasteful number, since it uses less digits than its factorization.

212221215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11213 (or 11204 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 212221215 is about 14567.8143521944. The cubic root of 212221215 is about 596.4805208093.

Adding to 212221215 its reverse (512122212), we get a palindrome (724343427).

The spelling of 212221215 in words is "two hundred twelve million, two hundred twenty-one thousand, two hundred fifteen".