215312130 has 96 divisors (see below), whose sum is σ = 618658560. Its totient is φ = 51517440.

The previous prime is 215312087. The next prime is 215312159. The reversal of 215312130 is 31213512.

215312130 is a `hidden beast` number, since 2 + 1 + 531 + 2 + 130 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 76834 + ... + 79586.

It is an arithmetic number, because the mean of its divisors is an integer number (6444360).

Almost surely, 2^215312130 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215312130, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309329280).

215312130 is an abundant number, since it is smaller than the sum of its proper divisors (403346430).

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

215312130 is a wasteful number, since it uses less digits than its factorization.

215312130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2856 (or 2853 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 215312130 is about 14673.5179830878. The cubic root of 215312130 is about 599.3624060299.

Adding to 215312130 its reverse (31213512), we get a palindrome (246525642).

The spelling of 215312130 in words is "two hundred fifteen million, three hundred twelve thousand, one hundred thirty".