168418421 has 4 divisors (see below), whose sum is σ = 168524832. Its totient is φ = 168312012.

The previous prime is 168418417. The next prime is 168418423. The reversal of 168418421 is 124814861.

It is a happy number.

168418421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 124814861 = 281 ⋅444181.

It is a cyclic number.

It is not a de Polignac number, because 168418421 - 2² = 168418417 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168418423) 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, 50795 + ... + 54008.

It is an arithmetic number, because the mean of its divisors is an integer number (42131208).

Almost surely, 2^168418421 is an apocalyptic number.

It is an amenable number.

168418421 is a deficient number, since it is larger than the sum of its proper divisors (106411).

168418421 is a wasteful number, since it uses less digits than its factorization.

168418421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106410.

The product of its digits is 12288, while the sum is 35.

The square root of 168418421 is about 12977.6122996490. The cubic root of 168418421 is about 552.2425474826.

It can be divided in two parts, 16841 and 8421, that multiplied together give a triangular number (141818061 = T₁₆₈₄₁).

The spelling of 168418421 in words is "one hundred sixty-eight million, four hundred eighteen thousand, four hundred twenty-one".