2130221660 has 96 divisors (see below), whose sum is σ = 5176870272. Its totient is φ = 721244160.

The previous prime is 2130221657. The next prime is 2130221693. The reversal of 2130221660 is 661220312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6805664 + ... + 6805976.

It is an arithmetic number, because the mean of its divisors is an integer number (53925732).

Almost surely, 2^2130221660 is an apocalyptic number.

2130221660 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 2130221660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2588435136).

2130221660 is an abundant number, since it is smaller than the sum of its proper divisors (3046648612).

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

2130221660 is a wasteful number, since it uses less digits than its factorization.

2130221660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783 (or 781 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 2130221660 is about 46154.3243911120. The cubic root of 2130221660 is about 1286.6929816746.

Adding to 2130221660 its reverse (661220312), we get a palindrome (2791441972).

The spelling of 2130221660 in words is "two billion, one hundred thirty million, two hundred twenty-one thousand, six hundred sixty".