402121242242 has 4 divisors (see below), whose sum is σ = 603181863366. Its totient is φ = 201060621120.

The previous prime is 402121242181. The next prime is 402121242301. The reversal of 402121242242 is 242242121204.

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., 324420237241 + 77701005001 = 569579^2 + 278749^2 .

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, 100530310559 + ... + 100530310562.

Almost surely, 2^402121242242 is an apocalyptic number.

402121242242 is a deficient number, since it is larger than the sum of its proper divisors (201060621124).

402121242242 is a wasteful number, since it uses less digits than its factorization.

402121242242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201060621123.

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 402121242242 its reverse (242242121204), we get a palindrome (644363363446).

The spelling of 402121242242 in words is "four hundred two billion, one hundred twenty-one million, two hundred forty-two thousand, two hundred forty-two".