201221312242 has 8 divisors (see below), whose sum is σ = 302954021100. Its totient is φ = 100236638544.

The previous prime is 201221312153. The next prime is 201221312267. The reversal of 201221312242 is 242213122102.

It can be written as a sum of positive squares in 2 ways, for example, as 137167270321 + 64054041921 = 370361^2 + 253089^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187008117 + ... + 187009192.

Almost surely, 2^201221312242 is an apocalyptic number.

201221312242 is a deficient number, since it is larger than the sum of its proper divisors (101732708858).

201221312242 is a wasteful number, since it uses less digits than its factorization.

201221312242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374017580.

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 201221312242 its reverse (242213122102), we get a palindrome (443434434344).

The spelling of 201221312242 in words is "two hundred one billion, two hundred twenty-one million, three hundred twelve thousand, two hundred forty-two".