42031655521 has 4 divisors (see below), whose sum is σ = 42925946112. Its totient is φ = 41137364932.

The previous prime is 42031655473. The next prime is 42031655537. The reversal of 42031655521 is 12555613024.

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 42031655521 - 2¹⁵ = 42031622753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42031655591) 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, 447145225 + ... + 447145318.

It is an arithmetic number, because the mean of its divisors is an integer number (10731486528).

Almost surely, 2^42031655521 is an apocalyptic number.

It is an amenable number.

42031655521 is a deficient number, since it is larger than the sum of its proper divisors (894290591).

42031655521 is an equidigital number, since it uses as much as digits as its factorization.

42031655521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894290590.

The product of its (nonzero) digits is 36000, while the sum is 34.

The spelling of 42031655521 in words is "forty-two billion, thirty-one million, six hundred fifty-five thousand, five hundred twenty-one".