218706212 has 6 divisors (see below), whose sum is σ = 382735878. Its totient is φ = 109353104.

The previous prime is 218706193. The next prime is 218706217. The reversal of 218706212 is 212607812.

218706212 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 196672576 + 22033636 = 14024^2 + 4694^2 .

It is not an unprimeable number, because it can be changed into a prime (218706217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27338273 + ... + 27338280.

It is an arithmetic number, because the mean of its divisors is an integer number (63789313).

Almost surely, 2^218706212 is an apocalyptic number.

It is an amenable number.

218706212 is a deficient number, since it is larger than the sum of its proper divisors (164029666).

218706212 is a wasteful number, since it uses less digits than its factorization.

218706212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54676557 (or 54676555 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 218706212 is about 14788.7190790819. The cubic root of 218706212 is about 602.4953594335.

It can be divided in two parts, 21870 and 6212, that added together give a palindrome (28082).

The spelling of 218706212 in words is "two hundred eighteen million, seven hundred six thousand, two hundred twelve".