167421 has 4 divisors (see below), whose sum is σ = 223232. Its totient is φ = 111612.

The previous prime is 167413. The next prime is 167423. The reversal of 167421 is 124761.

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.

It is not a de Polignac number, because 167421 - 2³ = 167413 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

167421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (167423) 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, 27901 + ... + 27906.

It is an arithmetic number, because the mean of its divisors is an integer number (55808).

2¹⁶⁷⁴²¹ is an apocalyptic number.

It is an amenable number.

167421 is a deficient number, since it is larger than the sum of its proper divisors (55811).

167421 is an equidigital number, since it uses as much as digits as its factorization.

167421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55810.

The product of its digits is 336, while the sum is 21.

The square root of 167421 is about 409.1711133499. The cubic root of 167421 is about 55.1150209979.

It can be divided in two parts, 167 and 421, that multiplied together give a palindrome (70307).

The spelling of 167421 in words is "one hundred sixty-seven thousand, four hundred twenty-one".