42423451221 has 16 divisors (see below), whose sum is σ = 57193463808. Its totient is φ = 27969303600.

The previous prime is 42423451219. The next prime is 42423451223. The reversal of 42423451221 is 12215432424.

It is a happy number.

42423451221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (42423451219) and next prime (42423451223).

It is not a de Polignac number, because 42423451221 - 2¹ = 42423451219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42423451223) 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, 60525 + ... + 297506.

It is an arithmetic number, because the mean of its divisors is an integer number (3574591488).

Almost surely, 2^42423451221 is an apocalyptic number.

It is an amenable number.

42423451221 is a deficient number, since it is larger than the sum of its proper divisors (14770012587).

42423451221 is a wasteful number, since it uses less digits than its factorization.

42423451221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358472.

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

Adding to 42423451221 its reverse (12215432424), we get a palindrome (54638883645).

The spelling of 42423451221 in words is "forty-two billion, four hundred twenty-three million, four hundred fifty-one thousand, two hundred twenty-one".