85168421 has 4 divisors (see below), whose sum is σ = 91719852. Its totient is φ = 78616992.

The previous prime is 85168409. The next prime is 85168427. The reversal of 85168421 is 12486158.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12486158 = 2 ⋅6243079.

It can be written as a sum of positive squares in 2 ways, for example, as 20124196 + 65044225 = 4486^2 + 8065^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85168421 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 (85168427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3275696 + ... + 3275721.

It is an arithmetic number, because the mean of its divisors is an integer number (22929963).

Almost surely, 2^85168421 is an apocalyptic number.

It is an amenable number.

85168421 is a deficient number, since it is larger than the sum of its proper divisors (6551431).

85168421 is a wasteful number, since it uses less digits than its factorization.

85168421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6551430.

The product of its digits is 15360, while the sum is 35.

The square root of 85168421 is about 9228.6738483923. The cubic root of 85168421 is about 439.9731750175.

The spelling of 85168421 in words is "eighty-five million, one hundred sixty-eight thousand, four hundred twenty-one".