215430222 has 64 divisors (see below), whose sum is σ = 538251264. Its totient is φ = 56056320.

The previous prime is 215430211. The next prime is 215430247. The reversal of 215430222 is 222034512.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17268 + ... + 27000.

It is an arithmetic number, because the mean of its divisors is an integer number (8410176).

Almost surely, 2^215430222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215430222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (269125632).

215430222 is an abundant number, since it is smaller than the sum of its proper divisors (322821042).

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

215430222 is a wasteful number, since it uses less digits than its factorization.

215430222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9793.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 215430222 is about 14677.5414153734. The cubic root of 215430222 is about 599.4719632093.

Adding to 215430222 its reverse (222034512), we get a palindrome (437464734).

The spelling of 215430222 in words is "two hundred fifteen million, four hundred thirty thousand, two hundred twenty-two".