220721324 has 12 divisors (see below), whose sum is σ = 386867544. Its totient is φ = 110187744.

The previous prime is 220721287. The next prime is 220721329. The reversal of 220721324 is 423127022.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 220721324.

It is not an unprimeable number, because it can be changed into a prime (220721329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40337 + ... + 45480.

It is an arithmetic number, because the mean of its divisors is an integer number (32238962).

Almost surely, 2^220721324 is an apocalyptic number.

It is an amenable number.

220721324 is a deficient number, since it is larger than the sum of its proper divisors (166146220).

220721324 is a wasteful number, since it uses less digits than its factorization.

220721324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86464 (or 86462 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 220721324 is about 14856.6929025271. The cubic root of 220721324 is about 604.3401261074.

Adding to 220721324 its reverse (423127022), we get a palindrome (643848346).

The spelling of 220721324 in words is "two hundred twenty million, seven hundred twenty-one thousand, three hundred twenty-four".