221311312404 has 144 divisors (see below), whose sum is σ = 647234179200. Its totient is φ = 58338572544.

The previous prime is 221311312403. The next prime is 221311312421. The reversal of 221311312404 is 404213113122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221311312403) 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 47 ways as a sum of consecutive naturals, for example, 18255457 + ... + 18267575.

It is an arithmetic number, because the mean of its divisors is an integer number (4494681800).

Almost surely, 2^221311312404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221311312404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323617089600).

221311312404 is an abundant number, since it is smaller than the sum of its proper divisors (425922866796).

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

221311312404 is a wasteful number, since it uses less digits than its factorization.

221311312404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14542 (or 14533 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 221311312404 its reverse (404213113122), we get a palindrome (625524425526).

The spelling of 221311312404 in words is "two hundred twenty-one billion, three hundred eleven million, three hundred twelve thousand, four hundred four".