42155521521 has 8 divisors (see below), whose sum is σ = 59165644320. Its totient is φ = 26624539872.

The previous prime is 42155521493. The next prime is 42155521561. The reversal of 42155521521 is 12512555124.

42155521521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42155521521 - 2⁷ = 42155521393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42155521561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369785220 + ... + 369785333.

It is an arithmetic number, because the mean of its divisors is an integer number (7395705540).

Almost surely, 2^42155521521 is an apocalyptic number.

It is an amenable number.

42155521521 is a deficient number, since it is larger than the sum of its proper divisors (17010122799).

42155521521 is a wasteful number, since it uses less digits than its factorization.

42155521521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739570575.

The product of its digits is 20000, while the sum is 33.

The spelling of 42155521521 in words is "forty-two billion, one hundred fifty-five million, five hundred twenty-one thousand, five hundred twenty-one".