42002434011521 has 16 divisors (see below), whose sum is σ = 44931641337600. Its totient is φ = 39147828052608.

The previous prime is 42002434011443. The next prime is 42002434011533. The reversal of 42002434011521 is 12511043420024.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42002434011521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42002434011721) 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, 37589081 + ... + 38690358.

It is an arithmetic number, because the mean of its divisors is an integer number (2808227583600).

Almost surely, 2^{42002434011521} is an apocalyptic number.

It is an amenable number.

42002434011521 is a deficient number, since it is larger than the sum of its proper divisors (2929207326079).

42002434011521 is a wasteful number, since it uses less digits than its factorization.

42002434011521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76279928.

The product of its (nonzero) digits is 7680, while the sum is 29.

Adding to 42002434011521 its reverse (12511043420024), we get a palindrome (54513477431545).

The spelling of 42002434011521 in words is "forty-two trillion, two billion, four hundred thirty-four million, eleven thousand, five hundred twenty-one".