2181538110576 has 160 divisors (see below), whose sum is σ = 6293508832512. Its totient is φ = 645435463680.

The previous prime is 2181538110571. The next prime is 2181538110601. The reversal of 2181538110576 is 6750118351812.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181538110571) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59761386 + ... + 59797878.

Almost surely, 2^{2181538110576} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2181538110576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3146754416256).

2181538110576 is an abundant number, since it is smaller than the sum of its proper divisors (4111970721936).

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

2181538110576 is a wasteful number, since it uses less digits than its factorization.

2181538110576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39191 (or 39185 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 48.

The spelling of 2181538110576 in words is "two trillion, one hundred eighty-one billion, five hundred thirty-eight million, one hundred ten thousand, five hundred seventy-six".