218211996 has 12 divisors (see below), whose sum is σ = 509161352. Its totient is φ = 72737328.

The previous prime is 218211947. The next prime is 218211997. The reversal of 218211996 is 699112812.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218211997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9092155 + ... + 9092178.

Almost surely, 2^218211996 is an apocalyptic number.

It is an amenable number.

218211996 is an abundant number, since it is smaller than the sum of its proper divisors (290949356).

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

218211996 is a wasteful number, since it uses less digits than its factorization.

218211996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18184340 (or 18184338 counting only the distinct ones).

The product of its digits is 15552, while the sum is 39.

The square root of 218211996 is about 14772.0004061738. Note that the first 3 decimals coincide. The cubic root of 218211996 is about 602.0411924588.

The spelling of 218211996 in words is "two hundred eighteen million, two hundred eleven thousand, nine hundred ninety-six".