42835691821 has 4 divisors (see below), whose sum is σ = 46130745052. Its totient is φ = 39540638592.

The previous prime is 42835691753. The next prime is 42835691851. The reversal of 42835691821 is 12819653824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18410690596 + 24425001225 = 135686^2 + 156285^2 .

It is not a de Polignac number, because 42835691821 - 2¹¹ = 42835689773 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 (42835691851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1647526596 + ... + 1647526621.

It is an arithmetic number, because the mean of its divisors is an integer number (11532686263).

Almost surely, 2^42835691821 is an apocalyptic number.

It is an amenable number.

42835691821 is a deficient number, since it is larger than the sum of its proper divisors (3295053231).

42835691821 is a wasteful number, since it uses less digits than its factorization.

42835691821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3295053230.

The product of its digits is 829440, while the sum is 49.

The spelling of 42835691821 in words is "forty-two billion, eight hundred thirty-five million, six hundred ninety-one thousand, eight hundred twenty-one".