215942534242 has 4 divisors (see below), whose sum is σ = 323913801366. Its totient is φ = 107971267120.

The previous prime is 215942534191. The next prime is 215942534261. The reversal of 215942534242 is 242435249512.

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., 148779146961 + 67163387281 = 385719^2 + 259159^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53985633559 + ... + 53985633562.

Almost surely, 2^215942534242 is an apocalyptic number.

215942534242 is a deficient number, since it is larger than the sum of its proper divisors (107971267124).

215942534242 is a wasteful number, since it uses less digits than its factorization.

215942534242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107971267123.

The product of its digits is 691200, while the sum is 43.

The spelling of 215942534242 in words is "two hundred fifteen billion, nine hundred forty-two million, five hundred thirty-four thousand, two hundred forty-two".