221405484440 has 32 divisors (see below), whose sum is σ = 569328389280. Its totient is φ = 75910451712.

The previous prime is 221405484437. The next prime is 221405484449. The reversal of 221405484440 is 44484504122.

221405484440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221405484440² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221405484394 and 221405484403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221405484449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395366657 + ... + 395367216.

It is an arithmetic number, because the mean of its divisors is an integer number (17791512165).

Almost surely, 2^221405484440 is an apocalyptic number.

221405484440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221405484440 is an abundant number, since it is smaller than the sum of its proper divisors (347922904840).

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

221405484440 is a wasteful number, since it uses less digits than its factorization.

221405484440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790733891 (or 790733887 counting only the distinct ones).

The product of its (nonzero) digits is 163840, while the sum is 38.

Adding to 221405484440 its reverse (44484504122), we get a palindrome (265889988562).

The spelling of 221405484440 in words is "two hundred twenty-one billion, four hundred five million, four hundred eighty-four thousand, four hundred forty".