212218650 has 192 divisors, whose sum is σ = 708168960. Its totient is φ = 45619200.

The previous prime is 212218649. The next prime is 212218679. The reversal of 212218650 is 56812212.

It is a happy number.

212218650 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 1 + 8 + 650 = 666.

212218650 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 159990 + ... + 161310.

It is an arithmetic number, because the mean of its divisors is an integer number (3688380).

Almost surely, 2^212218650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 212218650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (354084480).

212218650 is an abundant number, since it is smaller than the sum of its proper divisors (495950310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212218650 is a wasteful number, since it uses less digits than its factorization.

212218650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366 (or 1355 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 212218650 is about 14567.7263153864. The cubic root of 212218650 is about 596.4781176900.

It can be divided in two parts, 21 and 2218650, that added together give a triangular number (2218671 = T₂₁₀₆).

The spelling of 212218650 in words is "two hundred twelve million, two hundred eighteen thousand, six hundred fifty".