2181959520 has 384 divisors, whose sum is σ = 7980166656. Its totient is φ = 496336896.

The previous prime is 2181959477. The next prime is 2181959567. The reversal of 2181959520 is 259591812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7107207 + ... + 7107513.

It is an arithmetic number, because the mean of its divisors is an integer number (20781684).

Almost surely, 2^2181959520 is an apocalyptic number.

2181959520 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 2181959520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3990083328).

2181959520 is an abundant number, since it is smaller than the sum of its proper divisors (5798207136).

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

2181959520 is a wasteful number, since it uses less digits than its factorization.

2181959520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 42.

The square root of 2181959520 is about 46711.4495600383. The cubic root of 2181959520 is about 1297.0266404152.

The spelling of 2181959520 in words is "two billion, one hundred eighty-one million, nine hundred fifty-nine thousand, five hundred twenty".