221210323440 has 80 divisors (see below), whose sum is σ = 685814283648. Its totient is φ = 58984062208.

The previous prime is 221210323421. The next prime is 221210323493. The reversal of 221210323440 is 44323012122.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 221210323440.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3094987 + ... + 3165653.

Almost surely, 2^221210323440 is an apocalyptic number.

221210323440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221210323440 is an abundant number, since it is smaller than the sum of its proper divisors (464603960208).

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

221210323440 is a wasteful number, since it uses less digits than its factorization.

221210323440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83726 (or 83720 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 221210323440 its reverse (44323012122), we get a palindrome (265533335562).

The spelling of 221210323440 in words is "two hundred twenty-one billion, two hundred ten million, three hundred twenty-three thousand, four hundred forty".