221534500 has 96 divisors (see below), whose sum is σ = 539675136. Its totient is φ = 78752000.

The previous prime is 221534483. The next prime is 221534501. The reversal of 221534500 is 5435122.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (221534501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 258072 + ... + 258928.

It is an arithmetic number, because the mean of its divisors is an integer number (5621616).

Almost surely, 2^221534500 is an apocalyptic number.

221534500 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 221534500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269837568).

221534500 is an abundant number, since it is smaller than the sum of its proper divisors (318140636).

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

221534500 is a wasteful number, since it uses less digits than its factorization.

221534500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 934 (or 922 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 221534500 is about 14884.0350711761. The cubic root of 221534500 is about 605.0813814893.

Adding to 221534500 its reverse (5435122), we get a palindrome (226969622).

The spelling of 221534500 in words is "two hundred twenty-one million, five hundred thirty-four thousand, five hundred".