212216650 has 12 divisors (see below), whose sum is σ = 394723062. Its totient is φ = 84886640.

The previous prime is 212216617. The next prime is 212216659. The reversal of 212216650 is 56612212.

It can be written as a sum of positive squares in 3 ways, for example, as 183304521 + 28912129 = 13539^2 + 5377^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (212216659) 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 in 5 ways as a sum of consecutive naturals, for example, 2122117 + ... + 2122216.

Almost surely, 2^212216650 is an apocalyptic number.

212216650 is a deficient number, since it is larger than the sum of its proper divisors (182506412).

212216650 is a wasteful number, since it uses less digits than its factorization.

212216650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4244345 (or 4244340 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 212216650 is about 14567.6576703326. The cubic root of 212216650 is about 596.4762438993.

Adding to 212216650 its reverse (56612212), we get a palindrome (268828862).

The spelling of 212216650 in words is "two hundred twelve million, two hundred sixteen thousand, six hundred fifty".