42821571165 has 16 divisors (see below), whose sum is σ = 70185600576. Its totient is φ = 22281142400.

The previous prime is 42821571137. The next prime is 42821571197. The reversal of 42821571165 is 56117512824.

It is a happy number.

It is not a de Polignac number, because 42821571165 - 2¹⁷ = 42821440093 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34813671 + ... + 34814900.

It is an arithmetic number, because the mean of its divisors is an integer number (4386600036).

Almost surely, 2^42821571165 is an apocalyptic number.

It is an amenable number.

42821571165 is a deficient number, since it is larger than the sum of its proper divisors (27364029411).

42821571165 is a wasteful number, since it uses less digits than its factorization.

42821571165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69628620.

The product of its digits is 134400, while the sum is 42.

The spelling of 42821571165 in words is "forty-two billion, eight hundred twenty-one million, five hundred seventy-one thousand, one hundred sixty-five".