168421 has 8 divisors (see below), whose sum is σ = 187488. Its totient is φ = 150000.

The previous prime is 168409. The next prime is 168433. The reversal of 168421 is 124861.

168421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (168409) and next prime (168433).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 5-Lehmer number, since φ(168421) divides (168421-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 168421 - 2⁷ = 168293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 168392 and 168401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168451) by changing a digit.

It is a nontrivial repunit in base 20.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 546 + ... + 796.

It is an arithmetic number, because the mean of its divisors is an integer number (23436).

2¹⁶⁸⁴²¹ is an apocalyptic number.

168421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

168421 is a deficient number, since it is larger than the sum of its proper divisors (19067).

168421 is a wasteful number, since it uses less digits than its factorization.

168421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323.

The product of its digits is 384, while the sum is 22.

The square root of 168421 is about 410.3912767104. The cubic root of 168421 is about 55.2245366308.

The spelling of 168421 in words is "one hundred sixty-eight thousand, four hundred twenty-one".