2181812358240 has 576 divisors, whose sum is σ = 8088401857536. Its totient is φ = 554344445952.

The previous prime is 2181812358119. The next prime is 2181812358241. The reversal of 2181812358240 is 428532181812.

2181812358240 is a `hidden beast` number, since 2 + 1 + 8 + 1 + 8 + 1 + 23 + 582 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181812358241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 235180482 + ... + 235189758.

It is an arithmetic number, because the mean of its divisors is an integer number (14042364336).

Almost surely, 2^{2181812358240} is an apocalyptic number.

2181812358240 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 2181812358240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4044200928768).

2181812358240 is an abundant number, since it is smaller than the sum of its proper divisors (5906589499296).

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

2181812358240 is a wasteful number, since it uses less digits than its factorization.

2181812358240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9593 (or 9573 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 45.

The spelling of 2181812358240 in words is "two trillion, one hundred eighty-one billion, eight hundred twelve million, three hundred fifty-eight thousand, two hundred forty".