216323140 has 48 divisors (see below), whose sum is σ = 506145024. Its totient is φ = 76985600.

The previous prime is 216323131. The next prime is 216323143. The reversal of 216323140 is 41323612.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (216323143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121 + ... + 20800.

It is an arithmetic number, because the mean of its divisors is an integer number (10544688).

Almost surely, 2^216323140 is an apocalyptic number.

216323140 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 216323140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253072512).

216323140 is an abundant number, since it is smaller than the sum of its proper divisors (289821884).

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

216323140 is a wasteful number, since it uses less digits than its factorization.

216323140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20988 (or 20986 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 216323140 is about 14707.9277942204. The cubic root of 216323140 is about 600.2990546228.

Adding to 216323140 its reverse (41323612), we get a palindrome (257646752).

The spelling of 216323140 in words is "two hundred sixteen million, three hundred twenty-three thousand, one hundred forty".