221539389366240 has 768 divisors, whose sum is σ = 894460972769280. Its totient is φ = 50706376704000.

The previous prime is 221539389366143. The next prime is 221539389366247. The reversal of 221539389366240 is 42663983935122.

It is a happy number.

221539389366240 is a `hidden beast` number, since 2 + 2 + 1 + 5 + 3 + 9 + 389 + 3 + 6 + 6 + 240 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221539389366247) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 58563922 + ... + 62231918.

It is an arithmetic number, because the mean of its divisors is an integer number (1164662724960).

Almost surely, 2^{221539389366240} is an apocalyptic number.

221539389366240 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 221539389366240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (447230486384640).

221539389366240 is an abundant number, since it is smaller than the sum of its proper divisors (672921583403040).

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

221539389366240 is a wasteful number, since it uses less digits than its factorization.

221539389366240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3668104 (or 3668090 counting only the distinct ones).

The product of its (nonzero) digits is 100776960, while the sum is 63.

The spelling of 221539389366240 in words is "two hundred twenty-one trillion, five hundred thirty-nine billion, three hundred eighty-nine million, three hundred sixty-six thousand, two hundred forty".