216101220 has 96 divisors (see below), whose sum is σ = 617379840. Its totient is φ = 56471040.

The previous prime is 216101219. The next prime is 216101227. The reversal of 216101220 is 22101612.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 216101220.

It is not an unprimeable number, because it can be changed into a prime (216101227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1131325 + ... + 1131515.

It is an arithmetic number, because the mean of its divisors is an integer number (6431040).

Almost surely, 2^216101220 is an apocalyptic number.

216101220 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 216101220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (308689920).

216101220 is an abundant number, since it is smaller than the sum of its proper divisors (401278620).

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

216101220 is a wasteful number, since it uses less digits than its factorization.

216101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 216101220 is about 14700.3816276993. The cubic root of 216101220 is about 600.0937075863.

Adding to 216101220 its reverse (22101612), we get a palindrome (238202832).

The spelling of 216101220 in words is "two hundred sixteen million, one hundred one thousand, two hundred twenty".