221302240 has 24 divisors (see below), whose sum is σ = 522826920. Its totient is φ = 88520832.

The previous prime is 221302223. The next prime is 221302241. The reversal of 221302240 is 42203122.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221302241) 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 3 ways as a sum of consecutive naturals, for example, 691410 + ... + 691729.

It is an arithmetic number, because the mean of its divisors is an integer number (21784455).

Almost surely, 2^221302240 is an apocalyptic number.

221302240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221302240 is an abundant number, since it is smaller than the sum of its proper divisors (301524680).

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

221302240 is a wasteful number, since it uses less digits than its factorization.

221302240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383154 (or 1383146 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 221302240 is about 14876.2307053904. The cubic root of 221302240 is about 604.8698488330.

Adding to 221302240 its reverse (42203122), we get a palindrome (263505362).

The spelling of 221302240 in words is "two hundred twenty-one million, three hundred two thousand, two hundred forty".