242640421045 has 16 divisors (see below), whose sum is σ = 317699445312. Its totient is φ = 176431829760.

The previous prime is 242640421043. The next prime is 242640421157. The reversal of 242640421045 is 540124046242.

It is not a de Polignac number, because 242640421045 - 2¹ = 242640421043 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 242640421045.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242640421043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133707 + ... + 709336.

It is an arithmetic number, because the mean of its divisors is an integer number (19856215332).

Almost surely, 2^242640421045 is an apocalyptic number.

It is an amenable number.

242640421045 is a deficient number, since it is larger than the sum of its proper divisors (75059024267).

242640421045 is a wasteful number, since it uses less digits than its factorization.

242640421045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 848292.

The product of its (nonzero) digits is 61440, while the sum is 34.

Adding to 242640421045 its reverse (540124046242), we get a palindrome (782764467287).

The spelling of 242640421045 in words is "two hundred forty-two billion, six hundred forty million, four hundred twenty-one thousand, forty-five".