168089421 has 16 divisors (see below), whose sum is σ = 239410944. Its totient is φ = 104530944.

The previous prime is 168089419. The next prime is 168089459. The reversal of 168089421 is 124980861.

It is not a de Polignac number, because 168089421 - 2¹ = 168089419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168089421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168089401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8821 + ... + 20346.

It is an arithmetic number, because the mean of its divisors is an integer number (14963184).

Almost surely, 2^168089421 is an apocalyptic number.

It is an amenable number.

168089421 is a deficient number, since it is larger than the sum of its proper divisors (71321523).

168089421 is a wasteful number, since it uses less digits than its factorization.

168089421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29300.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 168089421 is about 12964.9304278889. The cubic root of 168089421 is about 551.8827170225.

The spelling of 168089421 in words is "one hundred sixty-eight million, eighty-nine thousand, four hundred twenty-one".