215430242 has 4 divisors (see below), whose sum is σ = 323145366. Its totient is φ = 107715120.

The previous prime is 215430211. The next prime is 215430247. The reversal of 215430242 is 242034512.

It is a happy number.

215430242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 179801281 + 35628961 = 13409^2 + 5969^2 .

It is not an unprimeable number, because it can be changed into a prime (215430247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53857559 + ... + 53857562.

Almost surely, 2^215430242 is an apocalyptic number.

215430242 is a deficient number, since it is larger than the sum of its proper divisors (107715124).

215430242 is a wasteful number, since it uses less digits than its factorization.

215430242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107715123.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 215430242 is about 14677.5420966864. The cubic root of 215430242 is about 599.4719817605.

Adding to 215430242 its reverse (242034512), we get a palindrome (457464754).

The spelling of 215430242 in words is "two hundred fifteen million, four hundred thirty thousand, two hundred forty-two".