42505540021 has 8 divisors (see below), whose sum is σ = 48598164224. Its totient is φ = 36418016880.

The previous prime is 42505539961. The next prime is 42505540037. The reversal of 42505540021 is 12004550524.

42505540021 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 42505540021 - 2³¹ = 40358056373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42505540061) 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, 1257390 + ... + 1290751.

It is an arithmetic number, because the mean of its divisors is an integer number (6074770528).

Almost surely, 2^42505540021 is an apocalyptic number.

It is an amenable number.

42505540021 is a deficient number, since it is larger than the sum of its proper divisors (6092624203).

42505540021 is a wasteful number, since it uses less digits than its factorization.

42505540021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2550531.

The product of its (nonzero) digits is 8000, while the sum is 28.

The spelling of 42505540021 in words is "forty-two billion, five hundred five million, five hundred forty thousand, twenty-one".