212878216 has 16 divisors (see below), whose sum is σ = 422626140. Its totient is φ = 100177920.

The previous prime is 212878207. The next prime is 212878217. The reversal of 212878216 is 612878212.

It can be written as a sum of positive squares in 2 ways, for example, as 208918116 + 3960100 = 14454^2 + 1990^2 .

It is not an unprimeable number, because it can be changed into a prime (212878217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 782505 + ... + 782776.

Almost surely, 2^212878216 is an apocalyptic number.

It is an amenable number.

212878216 is a deficient number, since it is larger than the sum of its proper divisors (209747924).

212878216 is a wasteful number, since it uses less digits than its factorization.

212878216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565304 (or 1565300 counting only the distinct ones).

The product of its digits is 21504, while the sum is 37.

The square root of 212878216 is about 14590.3466716867. The cubic root of 212878216 is about 597.0954209834.

The spelling of 212878216 in words is "two hundred twelve million, eight hundred seventy-eight thousand, two hundred sixteen".