221233324240 has 80 divisors (see below), whose sum is σ = 528479300160. Its totient is φ = 86096424960.

The previous prime is 221233324183. The next prime is 221233324267. The reversal of 221233324240 is 42423332122.

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

It is a junction number, because it is equal to n+sod(n) for n = 221233324199 and 221233324208.

It is a congruent number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 216235 + ... + 699445.

It is an arithmetic number, because the mean of its divisors is an integer number (6605991252).

Almost surely, 2^221233324240 is an apocalyptic number.

221233324240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221233324240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (264239650080).

221233324240 is an abundant number, since it is smaller than the sum of its proper divisors (307245975920).

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

221233324240 is a wasteful number, since it uses less digits than its factorization.

221233324240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483380 (or 483374 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 221233324240 its reverse (42423332122), we get a palindrome (263656656362).

The spelling of 221233324240 in words is "two hundred twenty-one billion, two hundred thirty-three million, three hundred twenty-four thousand, two hundred forty".