42231005521 has 4 divisors (see below), whose sum is σ = 42306016752. Its totient is φ = 42155994292.

The previous prime is 42231005503. The next prime is 42231005561. The reversal of 42231005521 is 12550013224.

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 42231005521 - 2⁵ = 42231005489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42231005561) 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, 37504771 + ... + 37505896.

It is an arithmetic number, because the mean of its divisors is an integer number (10576504188).

Almost surely, 2^42231005521 is an apocalyptic number.

It is an amenable number.

42231005521 is a deficient number, since it is larger than the sum of its proper divisors (75011231).

42231005521 is an equidigital number, since it uses as much as digits as its factorization.

42231005521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75011230.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 42231005521 its reverse (12550013224), we get a palindrome (54781018745).

The spelling of 42231005521 in words is "forty-two billion, two hundred thirty-one million, five thousand, five hundred twenty-one".