221244500 has 24 divisors (see below), whose sum is σ = 483199080. Its totient is φ = 88497600.

The previous prime is 221244481. The next prime is 221244523. The reversal of 221244500 is 5442122.

It is a happy number.

221244500 is digitally balanced in base 3, 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 4 ways, for example, as 662596 + 220581904 = 814^2 + 14852^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220745 + ... + 221744.

It is an arithmetic number, because the mean of its divisors is an integer number (20133295).

Almost surely, 2^221244500 is an apocalyptic number.

221244500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221244500 is an abundant number, since it is smaller than the sum of its proper divisors (261954580).

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

221244500 is a wasteful number, since it uses less digits than its factorization.

221244500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442508 (or 442496 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 221244500 is about 14874.2898990170. The cubic root of 221244500 is about 604.8172386968.

Adding to 221244500 its reverse (5442122), we get a palindrome (226686622).

The spelling of 221244500 in words is "two hundred twenty-one million, two hundred forty-four thousand, five hundred".