42531040421 has 2 divisors, whose sum is σ = 42531040422. Its totient is φ = 42531040420.

The previous prime is 42531040417. The next prime is 42531040459. The reversal of 42531040421 is 12404013524.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27083284900 + 15447755521 = 164570^2 + 124289^2 .

It is a cyclic number.

It is not a de Polignac number, because 42531040421 - 2² = 42531040417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42531040411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21265520210 + 21265520211.

It is an arithmetic number, because the mean of its divisors is an integer number (21265520211).

Almost surely, 2^42531040421 is an apocalyptic number.

It is an amenable number.

42531040421 is a deficient number, since it is larger than the sum of its proper divisors (1).

42531040421 is an equidigital number, since it uses as much as digits as its factorization.

42531040421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 42531040421 its reverse (12404013524), we get a palindrome (54935053945).

The spelling of 42531040421 in words is "forty-two billion, five hundred thirty-one million, forty thousand, four hundred twenty-one".