85421 has 4 divisors (see below), whose sum is σ = 97632. Its totient is φ = 73212.

The previous prime is 85411. The next prime is 85427. The reversal of 85421 is 12458.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12458 = 2 ⋅6229.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 85393 and 85402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6095 + ... + 6108.

It is an arithmetic number, because the mean of its divisors is an integer number (24408).

2⁸⁵⁴²¹ is an apocalyptic number.

It is an amenable number.

85421 is a deficient number, since it is larger than the sum of its proper divisors (12211).

85421 is a wasteful number, since it uses less digits than its factorization.

85421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12210.

The product of its digits is 320, while the sum is 20.

The square root of 85421 is about 292.2687119758. The cubic root of 85421 is about 44.0407680001.

Adding to 85421 its reverse (12458), we get a palindrome (97879).

The spelling of 85421 in words is "eighty-five thousand, four hundred twenty-one".