221550500 has 48 divisors (see below), whose sum is σ = 486280704. Its totient is φ = 88178400.

The previous prime is 221550479. The next prime is 221550529. The reversal of 221550500 is 5055122.

221550500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110507 + ... + 112493.

It is an arithmetic number, because the mean of its divisors is an integer number (10130848).

Almost surely, 2^221550500 is an apocalyptic number.

221550500 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 221550500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243140352).

221550500 is an abundant number, since it is smaller than the sum of its proper divisors (264730204).

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

221550500 is a wasteful number, since it uses less digits than its factorization.

221550500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2229 (or 2217 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 221550500 is about 14884.5725501272. The cubic root of 221550500 is about 605.0959481731.

The spelling of 221550500 in words is "two hundred twenty-one million, five hundred fifty thousand, five hundred".