221200540 has 24 divisors (see below), whose sum is σ = 506750832. Its totient is φ = 80436480.

The previous prime is 221200519. The next prime is 221200547. The reversal of 221200540 is 45002122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221200547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 502509 + ... + 502948.

It is an arithmetic number, because the mean of its divisors is an integer number (21114618).

Almost surely, 2^221200540 is an apocalyptic number.

221200540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221200540 is an abundant number, since it is smaller than the sum of its proper divisors (285550292).

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

221200540 is a wasteful number, since it uses less digits than its factorization.

221200540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005477 (or 1005475 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 221200540 is about 14872.8121080043. The cubic root of 221200540 is about 604.7771781500. Note that the first 3 decimals are identical.

Adding to 221200540 its reverse (45002122), we get a palindrome (266202662).

The spelling of 221200540 in words is "two hundred twenty-one million, two hundred thousand, five hundred forty".