215221024330 has 32 divisors (see below), whose sum is σ = 422912733264. Its totient is φ = 78377642496.

The previous prime is 215221024309. The next prime is 215221024363. The reversal of 215221024330 is 33420122512.

It can be written as a sum of positive squares in 8 ways, for example, as 71897450769 + 143323573561 = 268137^2 + 378581^2 .

It is a junction number, because it is equal to n+sod(n) for n = 215221024295 and 215221024304.

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, 11329869 + ... + 11348848.

Almost surely, 2^215221024330 is an apocalyptic number.

215221024330 is a deficient number, since it is larger than the sum of its proper divisors (207691708934).

215221024330 is a wasteful number, since it uses less digits than its factorization.

215221024330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22678810.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 215221024330 its reverse (33420122512), we get a palindrome (248641146842).

The spelling of 215221024330 in words is "two hundred fifteen billion, two hundred twenty-one million, twenty-four thousand, three hundred thirty".