216210660 has 96 divisors (see below), whose sum is σ = 631532160. Its totient is φ = 55200768.

The previous prime is 216210629. The next prime is 216210667. The reversal of 216210660 is 66012612.

216210660 is digitally balanced in base 2, base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

216210660 is strictly pandigital in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 216210660.

It is not an unprimeable number, because it can be changed into a prime (216210667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 237927 + ... + 238833.

It is an arithmetic number, because the mean of its divisors is an integer number (6578460).

Almost surely, 2^216210660 is an apocalyptic number.

216210660 is a gapful number since it is divisible by the number (20) 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 216210660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (315766080).

216210660 is an abundant number, since it is smaller than the sum of its proper divisors (415321500).

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

216210660 is a wasteful number, since it uses less digits than its factorization.

216210660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085 (or 1083 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 216210660 is about 14704.1035088849. The cubic root of 216210660 is about 600.1949921788.

The spelling of 216210660 in words is "two hundred sixteen million, two hundred ten thousand, six hundred sixty".