42040012421 has 16 divisors (see below), whose sum is σ = 48529870848. Its totient is φ = 36041636400.

The previous prime is 42040012381. The next prime is 42040012451. The reversal of 42040012421 is 12421004024.

It is a de Polignac number, because none of the positive numbers 2^k-42040012421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42040012393 and 42040012402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42040012451) 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 15 ways as a sum of consecutive naturals, for example, 1152221 + ... + 1188146.

It is an arithmetic number, because the mean of its divisors is an integer number (3033116928).

Almost surely, 2^42040012421 is an apocalyptic number.

It is an amenable number.

42040012421 is a deficient number, since it is larger than the sum of its proper divisors (6489858427).

42040012421 is a wasteful number, since it uses less digits than its factorization.

42040012421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2340472.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 42040012421 its reverse (12421004024), we get a palindrome (54461016445).

The spelling of 42040012421 in words is "forty-two billion, forty million, twelve thousand, four hundred twenty-one".