168421205 has 4 divisors (see below), whose sum is σ = 202105452. Its totient is φ = 134736960.

The previous prime is 168421129. The next prime is 168421213. The reversal of 168421205 is 502124861.

168421205 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.

It can be written as a sum of positive squares in 2 ways, for example, as 83302129 + 85119076 = 9127^2 + 9226^2 .

It is not a de Polignac number, because 168421205 - 2⁸ = 168420949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16842116 + ... + 16842125.

It is an arithmetic number, because the mean of its divisors is an integer number (50526363).

Almost surely, 2^168421205 is an apocalyptic number.

It is an amenable number.

168421205 is a deficient number, since it is larger than the sum of its proper divisors (33684247).

168421205 is an equidigital number, since it uses as much as digits as its factorization.

168421205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33684246.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 168421205 is about 12977.7195608474. The cubic root of 168421205 is about 552.2455903698.

The spelling of 168421205 in words is "one hundred sixty-eight million, four hundred twenty-one thousand, two hundred five".