216221300 has 36 divisors (see below), whose sum is σ = 496804140. Its totient is φ = 81400320.

The previous prime is 216221281. The next prime is 216221323. The reversal of 216221300 is 3122612.

216221300 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 20557156 + 195664144 = 4534^2 + 13988^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61895 + ... + 65294.

It is an arithmetic number, because the mean of its divisors is an integer number (13800115).

Almost surely, 2^216221300 is an apocalyptic number.

216221300 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216221300 is an abundant number, since it is smaller than the sum of its proper divisors (280582840).

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

216221300 is a wasteful number, since it uses less digits than its factorization.

216221300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127220 (or 127213 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 216221300 is about 14704.4653081981. The cubic root of 216221300 is about 600.2048374688.

Adding to 216221300 its reverse (3122612), we get a palindrome (219343912).

It can be divided in two parts, 21622 and 1300, that added together give a palindrome (22922).

The spelling of 216221300 in words is "two hundred sixteen million, two hundred twenty-one thousand, three hundred".