2161320000 has 560 divisors, whose sum is σ = 8531668992. Its totient is φ = 472320000.

The previous prime is 2161319971. The next prime is 2161320113. The reversal of 2161320000 is 231612.

It is a tau number, because it is divible by the number of its divisors (560).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 26039959 + ... + 26040041.

Almost surely, 2^2161320000 is an apocalyptic number.

2161320000 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 2161320000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4265834496).

2161320000 is an abundant number, since it is smaller than the sum of its proper divisors (6370348992).

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

2161320000 is an equidigital number, since it uses as much as digits as its factorization.

2161320000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 131 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 2161320000 is about 46489.9989244999. The cubic root of 2161320000 is about 1292.9240801936.

Adding to 2161320000 its reverse (231612), we get a palindrome (2161551612).

The spelling of 2161320000 in words is "two billion, one hundred sixty-one million, three hundred twenty thousand".