218021012 has 24 divisors (see below), whose sum is σ = 424079712. Its totient is φ = 97229600.

The previous prime is 218020993. The next prime is 218021021. The reversal of 218021012 is 210120812.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44414 + ... + 49077.

It is an arithmetic number, because the mean of its divisors is an integer number (17669988).

Almost surely, 2^218021012 is an apocalyptic number.

218021012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

218021012 is a deficient number, since it is larger than the sum of its proper divisors (206058700).

218021012 is a wasteful number, since it uses less digits than its factorization.

218021012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93559 (or 93557 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 218021012 is about 14765.5345991942. The cubic root of 218021012 is about 601.8655012381.

Adding to 218021012 its reverse (210120812), we get a palindrome (428141824).

The spelling of 218021012 in words is "two hundred eighteen million, twenty-one thousand, twelve".