42043143221 has 4 divisors (see below), whose sum is σ = 42045385344. Its totient is φ = 42040901100.

The previous prime is 42043143203. The next prime is 42043143223. The reversal of 42043143221 is 12234134024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42043143221 - 2²⁶ = 41976034357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42043143223) 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, 1092695 + ... + 1130516.

It is an arithmetic number, because the mean of its divisors is an integer number (10511346336).

Almost surely, 2^42043143221 is an apocalyptic number.

It is an amenable number.

42043143221 is a deficient number, since it is larger than the sum of its proper divisors (2242123).

42043143221 is a wasteful number, since it uses less digits than its factorization.

42043143221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2242122.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 42043143221 its reverse (12234134024), we get a palindrome (54277277245).

The spelling of 42043143221 in words is "forty-two billion, forty-three million, one hundred forty-three thousand, two hundred twenty-one".