215511230 has 32 divisors (see below), whose sum is σ = 423792000. Its totient is φ = 78255520.

The previous prime is 215511223. The next prime is 215511239. The reversal of 215511230 is 32115512.

It is a happy number.

It is a super-2 number, since 2×215511230² = 92890180512225800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215511239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143021 + ... + 144519.

It is an arithmetic number, because the mean of its divisors is an integer number (13243500).

Almost surely, 2^215511230 is an apocalyptic number.

215511230 is a deficient number, since it is larger than the sum of its proper divisors (208280770).

215511230 is a wasteful number, since it uses less digits than its factorization.

215511230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2824.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 215511230 is about 14680.3007462381. The cubic root of 215511230 is about 599.5470933972.

Adding to 215511230 its reverse (32115512), we get a palindrome (247626742).

The spelling of 215511230 in words is "two hundred fifteen million, five hundred eleven thousand, two hundred thirty".