218935390212 has 432 divisors, whose sum is σ = 730630031040. Its totient is φ = 56685484800.

The previous prime is 218935390211. The next prime is 218935390213. The reversal of 218935390212 is 212093539812.

218935390212 is a `hidden beast` number, since 2 + 1 + 8 + 93 + 539 + 0 + 21 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (218935390211) and next prime (218935390213).

It is not an unprimeable number, because it can be changed into a prime (218935390211) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 266668762 + ... + 266669582.

It is an arithmetic number, because the mean of its divisors is an integer number (1691273220).

Almost surely, 2^218935390212 is an apocalyptic number.

218935390212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218935390212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (365315015520).

218935390212 is an abundant number, since it is smaller than the sum of its proper divisors (511694640828).

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

218935390212 is a wasteful number, since it uses less digits than its factorization.

218935390212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374 (or 1353 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 218935390212 in words is "two hundred eighteen billion, nine hundred thirty-five million, three hundred ninety thousand, two hundred twelve".