212816217 has 32 divisors (see below), whose sum is σ = 314986752. Its totient is φ = 127125504.

The previous prime is 212816213. The next prime is 212816273. The reversal of 212816217 is 712618212.

It is not a de Polignac number, because 212816217 - 2² = 212816213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212816213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 465453 + ... + 465909.

It is an arithmetic number, because the mean of its divisors is an integer number (9843336).

Almost surely, 2^212816217 is an apocalyptic number.

It is an amenable number.

212816217 is a deficient number, since it is larger than the sum of its proper divisors (102170535).

212816217 is a wasteful number, since it uses less digits than its factorization.

212816217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897.

The product of its digits is 2688, while the sum is 30.

The square root of 212816217 is about 14588.2218587462. The cubic root of 212816217 is about 597.0374490059.

The spelling of 212816217 in words is "two hundred twelve million, eight hundred sixteen thousand, two hundred seventeen".