42131000221 has 4 divisors (see below), whose sum is σ = 42294934332. Its totient is φ = 41967066112.

The previous prime is 42131000209. The next prime is 42131000239. The reversal of 42131000221 is 12200013124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40062024025 + 2068976196 = 200155^2 + 45486^2 .

It is a cyclic number.

It is not a de Polignac number, because 42131000221 - 2⁹ = 42130999709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42131000195 and 42131000204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42131000201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81966670 + ... + 81967183.

It is an arithmetic number, because the mean of its divisors is an integer number (10573733583).

Almost surely, 2^42131000221 is an apocalyptic number.

It is an amenable number.

42131000221 is a deficient number, since it is larger than the sum of its proper divisors (163934111).

42131000221 is a wasteful number, since it uses less digits than its factorization.

42131000221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163934110.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 42131000221 its reverse (12200013124), we get a palindrome (54331013345).

The spelling of 42131000221 in words is "forty-two billion, one hundred thirty-one million, two hundred twenty-one", and thus it is an aban number.