42547040521 has 4 divisors (see below), whose sum is σ = 44396911872. Its totient is φ = 40697169172.

The previous prime is 42547040477. The next prime is 42547040533. The reversal of 42547040521 is 12504074524.

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 a de Polignac number, because none of the positive numbers 2^k-42547040521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42547040821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 924935641 + ... + 924935686.

It is an arithmetic number, because the mean of its divisors is an integer number (11099227968).

Almost surely, 2^42547040521 is an apocalyptic number.

It is an amenable number.

42547040521 is a deficient number, since it is larger than the sum of its proper divisors (1849871351).

42547040521 is a wasteful number, since it uses less digits than its factorization.

42547040521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849871350.

The product of its (nonzero) digits is 44800, while the sum is 34.

The spelling of 42547040521 in words is "forty-two billion, five hundred forty-seven million, forty thousand, five hundred twenty-one".