221520072404 has 12 divisors (see below), whose sum is σ = 388102162644. Its totient is φ = 110633740224.

The previous prime is 221520072337. The next prime is 221520072409. The reversal of 221520072404 is 404270025122.

It can be written as a sum of positive squares in 2 ways, for example, as 165209731600 + 56310340804 = 406460^2 + 237298^2 .

It is a super-2 number, since 2×221520072404² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221520072409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31570049 + ... + 31577064.

It is an arithmetic number, because the mean of its divisors is an integer number (32341846887).

Almost surely, 2^221520072404 is an apocalyptic number.

It is an amenable number.

221520072404 is a deficient number, since it is larger than the sum of its proper divisors (166582090240).

221520072404 is a wasteful number, since it uses less digits than its factorization.

221520072404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63147994 (or 63147992 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 29.

Adding to 221520072404 its reverse (404270025122), we get a palindrome (625790097526).

The spelling of 221520072404 in words is "two hundred twenty-one billion, five hundred twenty million, seventy-two thousand, four hundred four".