42256285821 has 10 divisors (see below), whose sum is σ = 63123587582. Its totient is φ = 28170857160.

The previous prime is 42256285793. The next prime is 42256285831. The reversal of 42256285821 is 12858265224.

42256285821 is a `hidden beast` number, since 4 + 2 + 2 + 5 + 62 + 8 + 582 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 41977863225 + 278422596 = 204885^2 + 16686^2 .

It is not a de Polignac number, because 42256285821 - 2¹³ = 42256277629 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 (42256285831) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 260841190 + ... + 260841351.

Almost surely, 2^42256285821 is an apocalyptic number.

It is an amenable number.

42256285821 is a deficient number, since it is larger than the sum of its proper divisors (20867301761).

42256285821 is an equidigital number, since it uses as much as digits as its factorization.

42256285821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521682553 (or 521682544 counting only the distinct ones).

The product of its digits is 614400, while the sum is 45.

The spelling of 42256285821 in words is "forty-two billion, two hundred fifty-six million, two hundred eighty-five thousand, eight hundred twenty-one".