212817056 has 12 divisors (see below), whose sum is σ = 418983642. Its totient is φ = 106408512.

The previous prime is 212817053. The next prime is 212817079. The reversal of 212817056 is 650718212.

It can be written as a sum of positive squares in only one way, i.e., 114490000 + 98327056 = 10700^2 + 9916^2 .

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 6650533 = 212817056 / (2 + 1 + 2 + 8 + 1 + 7 + 0 + 5 + 6).

It is not an unprimeable number, because it can be changed into a prime (212817053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3325235 + ... + 3325298.

Almost surely, 2^212817056 is an apocalyptic number.

It is an amenable number.

212817056 is a deficient number, since it is larger than the sum of its proper divisors (206166586).

212817056 is an equidigital number, since it uses as much as digits as its factorization.

212817056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6650543 (or 6650535 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 212817056 is about 14588.2506147927. The cubic root of 212817056 is about 597.0382335854.

The spelling of 212817056 in words is "two hundred twelve million, eight hundred seventeen thousand, fifty-six".