42435421221 has 16 divisors (see below), whose sum is σ = 56909460608. Its totient is φ = 28125921600.

The previous prime is 42435421211. The next prime is 42435421229. The reversal of 42435421221 is 12212453424.

It is a happy number.

It is not a de Polignac number, because 42435421221 - 2¹⁰ = 42435420197 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42435421229) 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, 2340531 + ... + 2358591.

It is an arithmetic number, because the mean of its divisors is an integer number (3556841288).

Almost surely, 2^42435421221 is an apocalyptic number.

It is an amenable number.

42435421221 is a deficient number, since it is larger than the sum of its proper divisors (14474039387).

42435421221 is a wasteful number, since it uses less digits than its factorization.

42435421221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22572.

The product of its digits is 15360, while the sum is 30.

Adding to 42435421221 its reverse (12212453424), we get a palindrome (54647874645).

The spelling of 42435421221 in words is "forty-two billion, four hundred thirty-five million, four hundred twenty-one thousand, two hundred twenty-one".