216203312 has 80 divisors (see below), whose sum is σ = 482135808. Its totient is φ = 93139200.

The previous prime is 216203303. The next prime is 216203347. The reversal of 216203312 is 213302612.

It is a happy number.

It is a zygodrome in base 2.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205187 + ... + 206237.

Almost surely, 2^216203312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 216203312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241067904).

216203312 is an abundant number, since it is smaller than the sum of its proper divisors (265932496).

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

216203312 is a wasteful number, since it uses less digits than its factorization.

216203312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138 (or 1132 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 216203312 is about 14703.8536445382. The cubic root of 216203312 is about 600.1881928181.

Adding to 216203312 its reverse (213302612), we get a palindrome (429505924).

The spelling of 216203312 in words is "two hundred sixteen million, two hundred three thousand, three hundred twelve".