2187021330 has 128 divisors (see below), whose sum is σ = 6312579840. Its totient is φ = 535610880.

The previous prime is 2187021313. The next prime is 2187021337. The reversal of 2187021330 is 331207812.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2187021294 and 2187021303.

It is not an unprimeable number, because it can be changed into a prime (2187021337) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 739134 + ... + 742086.

It is an arithmetic number, because the mean of its divisors is an integer number (49317030).

Almost surely, 2^2187021330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2187021330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3156289920).

2187021330 is an abundant number, since it is smaller than the sum of its proper divisors (4125558510).

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

2187021330 is a wasteful number, since it uses less digits than its factorization.

2187021330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3193 (or 3187 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 2187021330 is about 46765.5998571600. The cubic root of 2187021330 is about 1298.0288331784.

The spelling of 2187021330 in words is "two billion, one hundred eighty-seven million, twenty-one thousand, three hundred thirty".