215340211242 has 24 divisors (see below), whose sum is σ = 502460493444. Its totient is φ = 66258526464.

The previous prime is 215340211241. The next prime is 215340211249. The reversal of 215340211242 is 242112043512.

215340211242 is a `hidden beast` number, since 2 + 1 + 5 + 3 + 402 + 11 + 242 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 215296928001 + 43283241 = 464001^2 + 6579^2 .

It is not an unprimeable number, because it can be changed into a prime (215340211241) by changing a digit.

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 in 11 ways as a sum of consecutive naturals, for example, 460128423 + ... + 460128890.

Almost surely, 2^215340211242 is an apocalyptic number.

215340211242 is an abundant number, since it is smaller than the sum of its proper divisors (287120282202).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215340211242 is a wasteful number, since it uses less digits than its factorization.

215340211242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920257334 (or 920257331 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

Adding to 215340211242 its reverse (242112043512), we get a palindrome (457452254754).

The spelling of 215340211242 in words is "two hundred fifteen billion, three hundred forty million, two hundred eleven thousand, two hundred forty-two".