2187821080 has 64 divisors (see below), whose sum is σ = 5073868800. Its totient is φ = 848534400.

The previous prime is 2187821047. The next prime is 2187821093. The reversal of 2187821080 is 801287812.

It is a super-2 number, since 2×2187821080² = 9573122156184732800, which 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 15 ways as a sum of consecutive naturals, for example, 234505 + ... + 243655.

It is an arithmetic number, because the mean of its divisors is an integer number (79279200).

Almost surely, 2^2187821080 is an apocalyptic number.

2187821080 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 2187821080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2536934400).

2187821080 is an abundant number, since it is smaller than the sum of its proper divisors (2886047720).

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

2187821080 is a wasteful number, since it uses less digits than its factorization.

2187821080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9344 (or 9340 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 37.

The square root of 2187821080 is about 46774.1496983109. The cubic root of 2187821080 is about 1298.1870349653.

The spelling of 2187821080 in words is "two billion, one hundred eighty-seven million, eight hundred twenty-one thousand, eighty".