42431844821 has 4 divisors (see below), whose sum is σ = 42433809600. Its totient is φ = 42429880044.

The previous prime is 42431844817. The next prime is 42431844857. The reversal of 42431844821 is 12844813424.

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 42431844821 - 2² = 42431844817 is a prime.

It is a super-2 number, since 2×42431844821² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42431844881) 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, 949631 + ... + 993308.

It is an arithmetic number, because the mean of its divisors is an integer number (10608452400).

Almost surely, 2^42431844821 is an apocalyptic number.

It is an amenable number.

42431844821 is a deficient number, since it is larger than the sum of its proper divisors (1964779).

42431844821 is a wasteful number, since it uses less digits than its factorization.

42431844821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1964778.

The product of its digits is 196608, while the sum is 41.

The spelling of 42431844821 in words is "forty-two billion, four hundred thirty-one million, eight hundred forty-four thousand, eight hundred twenty-one".