42040919531521 has 4 divisors (see below), whose sum is σ = 42040934075952. Its totient is φ = 42040904987092.

The previous prime is 42040919531509. The next prime is 42040919531543. The reversal of 42040919531521 is 12513591904024.

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 42040919531521 - 2⁷ = 42040919531393 is a prime.

It is a super-2 number, since 2×42040919531521² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42040919531551) 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, 1303471 + ... + 9261796.

It is an arithmetic number, because the mean of its divisors is an integer number (10510233518988).

Almost surely, 2^{42040919531521} is an apocalyptic number.

It is an amenable number.

42040919531521 is a deficient number, since it is larger than the sum of its proper divisors (14544431).

42040919531521 is a wasteful number, since it uses less digits than its factorization.

42040919531521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14544430.

The product of its (nonzero) digits is 388800, while the sum is 46.

The spelling of 42040919531521 in words is "forty-two trillion, forty billion, nine hundred nineteen million, five hundred thirty-one thousand, five hundred twenty-one".