215012504242 has 4 divisors (see below), whose sum is σ = 322518756366. Its totient is φ = 107506252120.

The previous prime is 215012504183. The next prime is 215012504243. The reversal of 215012504242 is 242405210512.

It is a happy number.

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., 162384014961 + 52628489281 = 402969^2 + 229409^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 215012504242.

It is not an unprimeable number, because it can be changed into a prime (215012504243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53753126059 + ... + 53753126062.

Almost surely, 2^215012504242 is an apocalyptic number.

215012504242 is a deficient number, since it is larger than the sum of its proper divisors (107506252124).

215012504242 is a wasteful number, since it uses less digits than its factorization.

215012504242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107506252123.

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 215012504242 its reverse (242405210512), we get a palindrome (457417714754).

The spelling of 215012504242 in words is "two hundred fifteen billion, twelve million, five hundred four thousand, two hundred forty-two".