221241500 has 48 divisors (see below), whose sum is σ = 496292160. Its totient is φ = 86097600.

The previous prime is 221241499. The next prime is 221241509. The reversal of 221241500 is 5142122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221241509) 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, 12521 + ... + 24479.

It is an arithmetic number, because the mean of its divisors is an integer number (10339420).

Almost surely, 2^221241500 is an apocalyptic number.

221241500 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 221241500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248146080).

221241500 is an abundant number, since it is smaller than the sum of its proper divisors (275050660).

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

221241500 is a wasteful number, since it uses less digits than its factorization.

221241500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12015 (or 12003 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 221241500 is about 14874.1890535249. The cubic root of 221241500 is about 604.8145049793.

Adding to 221241500 its reverse (5142122), we get a palindrome (226383622).

The spelling of 221241500 in words is "two hundred twenty-one million, two hundred forty-one thousand, five hundred".