42000555521 has 16 divisors (see below), whose sum is σ = 45168684480. Its totient is φ = 38910812160.

The previous prime is 42000555511. The next prime is 42000555539. The reversal of 42000555521 is 12555500024.

42000555521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 42000555521 - 2²² = 41996361217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42000555511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1591766 + ... + 1617936.

It is an arithmetic number, because the mean of its divisors is an integer number (2823042780).

Almost surely, 2^42000555521 is an apocalyptic number.

It is an amenable number.

42000555521 is a deficient number, since it is larger than the sum of its proper divisors (3168128959).

42000555521 is a wasteful number, since it uses less digits than its factorization.

42000555521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27664.

The product of its (nonzero) digits is 10000, while the sum is 29.

The spelling of 42000555521 in words is "forty-two billion, five hundred fifty-five thousand, five hundred twenty-one".