221303740 has 72 divisors (see below), whose sum is σ = 539935200. Its totient is φ = 74634624.

The previous prime is 221303737. The next prime is 221303741. The reversal of 221303740 is 47303122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221303741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1485186 + ... + 1485334.

It is an arithmetic number, because the mean of its divisors is an integer number (7499100).

Almost surely, 2^221303740 is an apocalyptic number.

221303740 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 221303740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269967600).

221303740 is an abundant number, since it is smaller than the sum of its proper divisors (318631460).

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

221303740 is a wasteful number, since it uses less digits than its factorization.

221303740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371 (or 266 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 22.

The square root of 221303740 is about 14876.2811213018. The cubic root of 221303740 is about 604.8712154448.

Adding to 221303740 its reverse (47303122), we get a palindrome (268606862).

The spelling of 221303740 in words is "two hundred twenty-one million, three hundred three thousand, seven hundred forty".