216012312 has 64 divisors (see below), whose sum is σ = 611388000. Its totient is φ = 70641792.

The previous prime is 216012299. The next prime is 216012323. The reversal of 216012312 is 213210612.

It is a super-2 number, since 2×216012312² = 93322637871170688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

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, 2014 + ... + 20882.

Almost surely, 2^216012312 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 216012312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305694000).

216012312 is an abundant number, since it is smaller than the sum of its proper divisors (395375688).

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

216012312 is a wasteful number, since it uses less digits than its factorization.

216012312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18937 (or 18927 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 216012312 is about 14697.3573134765. The cubic root of 216012312 is about 600.0113997834.

Adding to 216012312 its reverse (213210612), we get a palindrome (429222924).

The spelling of 216012312 in words is "two hundred sixteen million, twelve thousand, three hundred twelve".