242404421221 has 4 divisors (see below), whose sum is σ = 242410114444. Its totient is φ = 242398728000.

The previous prime is 242404421213. The next prime is 242404421261. The reversal of 242404421221 is 122124404242.

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 2 ways, for example, as 153965988225 + 88438432996 = 392385^2 + 297386^2 .

It is a cyclic number.

It is not a de Polignac number, because 242404421221 - 2³ = 242404421213 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 242404421221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242404421261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2782260 + ... + 2868061.

It is an arithmetic number, because the mean of its divisors is an integer number (60602528611).

Almost surely, 2^242404421221 is an apocalyptic number.

It is an amenable number.

242404421221 is a deficient number, since it is larger than the sum of its proper divisors (5693223).

242404421221 is an equidigital number, since it uses as much as digits as its factorization.

242404421221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5693222.

The product of its (nonzero) digits is 8192, while the sum is 28.

Adding to 242404421221 its reverse (122124404242), we get a palindrome (364528825463).

The spelling of 242404421221 in words is "two hundred forty-two billion, four hundred four million, four hundred twenty-one thousand, two hundred twenty-one".