168338421 has 24 divisors (see below), whose sum is σ = 249945696. Its totient is φ = 109116000.

The previous prime is 168338411. The next prime is 168338447. The reversal of 168338421 is 124833861.

It is not a de Polignac number, because 168338421 - 2¹¹ = 168336373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168338411) 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 23 ways as a sum of consecutive naturals, for example, 96271 + ... + 98003.

It is an arithmetic number, because the mean of its divisors is an integer number (10414404).

Almost surely, 2^168338421 is an apocalyptic number.

It is an amenable number.

168338421 is a deficient number, since it is larger than the sum of its proper divisors (81607275).

168338421 is a wasteful number, since it uses less digits than its factorization.

168338421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2033 (or 2030 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 168338421 is about 12974.5297024594. The cubic root of 168338421 is about 552.1550938645.

It can be divided in two parts, 1683 and 38421, that added together give a palindrome (40104).

The spelling of 168338421 in words is "one hundred sixty-eight million, three hundred thirty-eight thousand, four hundred twenty-one".