2181988352 has 64 divisors (see below), whose sum is σ = 4621790340. Its totient is φ = 1026555904.

The previous prime is 2181988349. The next prime is 2181988373. The reversal of 2181988352 is 2538891812.

It can be written as a sum of positive squares in 2 ways, for example, as 1972781056 + 209207296 = 44416^2 + 14464^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×2181988352² = 9522146336527351808, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2181988297 and 2181988306.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 555098 + ... + 559014.

Almost surely, 2^2181988352 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 2181988352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2310895170).

2181988352 is an abundant number, since it is smaller than the sum of its proper divisors (2439801988).

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

2181988352 is an frugal number, since it uses more digits than its factorization.

2181988352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3964 (or 3936 counting only the distinct ones).

The product of its digits is 276480, while the sum is 47.

The square root of 2181988352 is about 46711.7581771442. The cubic root of 2181988352 is about 1297.0323532782.

The spelling of 2181988352 in words is "two billion, one hundred eighty-one million, nine hundred eighty-eight thousand, three hundred fifty-two".