2181356498880 has 448 divisors, whose sum is σ = 8299123660800. Its totient is φ = 536182640640.

The previous prime is 2181356498857. The next prime is 2181356498897. The reversal of 2181356498880 is 888946531812.

2181356498880 is a `hidden beast` number, since 2 + 1 + 8 + 13 + 56 + 498 + 8 + 80 = 666.

It is a super-2 number, since 2×2181356498880² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 80744575 + ... + 80771585.

It is an arithmetic number, because the mean of its divisors is an integer number (18524829600).

Almost surely, 2^{2181356498880} is an apocalyptic number.

2181356498880 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 2181356498880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4149561830400).

2181356498880 is an abundant number, since it is smaller than the sum of its proper divisors (6117767161920).

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

2181356498880 is a wasteful number, since it uses less digits than its factorization.

2181356498880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27769 (or 27753 counting only the distinct ones).

The product of its (nonzero) digits is 26542080, while the sum is 63.

The spelling of 2181356498880 in words is "two trillion, one hundred eighty-one billion, three hundred fifty-six million, four hundred ninety-eight thousand, eight hundred eighty".