221313424 has 10 divisors (see below), whose sum is σ = 428794790. Its totient is φ = 110656704.

The previous prime is 221313401. The next prime is 221313427. The reversal of 221313424 is 424313122.

It can be written as a sum of positive squares in only one way, i.e., 151290000 + 70023424 = 12300^2 + 8368^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221313395 and 221313404.

It is not an unprimeable number, because it can be changed into a prime (221313427) 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 as a sum of consecutive naturals, namely, 6916029 + ... + 6916060.

It is an arithmetic number, because the mean of its divisors is an integer number (42879479).

Almost surely, 2^221313424 is an apocalyptic number.

It is an amenable number.

221313424 is a deficient number, since it is larger than the sum of its proper divisors (207481366).

221313424 is a wasteful number, since it uses less digits than its factorization.

221313424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13832097 (or 13832091 counting only the distinct ones).

The product of its digits is 1152, while the sum is 22.

The square root of 221313424 is about 14876.6066023136. The cubic root of 221313424 is about 604.8800381416.

Adding to 221313424 its reverse (424313122), we get a palindrome (645626546).

The spelling of 221313424 in words is "two hundred twenty-one million, three hundred thirteen thousand, four hundred twenty-four".