215135242 has 16 divisors (see below), whose sum is σ = 378771840. Its totient is φ = 89708688.

The previous prime is 215135209. The next prime is 215135243. The reversal of 215135242 is 242531512.

It is not an unprimeable number, because it can be changed into a prime (215135243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207142 + ... + 208177.

It is an arithmetic number, because the mean of its divisors is an integer number (23673240).

Almost surely, 2^215135242 is an apocalyptic number.

215135242 is a deficient number, since it is larger than the sum of its proper divisors (163636598).

215135242 is a wasteful number, since it uses less digits than its factorization.

215135242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415365.

The product of its digits is 2400, while the sum is 25.

The square root of 215135242 is about 14667.4892875366. The cubic root of 215135242 is about 599.1982272261.

Adding to 215135242 its reverse (242531512), we get a palindrome (457666754).

The spelling of 215135242 in words is "two hundred fifteen million, one hundred thirty-five thousand, two hundred forty-two".