168814921 has 4 divisors (see below), whose sum is σ = 184161744. Its totient is φ = 153468100.

The previous prime is 168814897. The next prime is 168814969. The reversal of 168814921 is 129418861.

168814921 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.

It is a cyclic number.

It is not a de Polignac number, because 168814921 - 2⁵ = 168814889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168814991) 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, 7673395 + ... + 7673416.

It is an arithmetic number, because the mean of its divisors is an integer number (46040436).

Almost surely, 2^168814921 is an apocalyptic number.

168814921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

168814921 is a deficient number, since it is larger than the sum of its proper divisors (15346823).

168814921 is a wasteful number, since it uses less digits than its factorization.

168814921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15346822.

The product of its digits is 27648, while the sum is 40.

The square root of 168814921 is about 12992.8796269341. The cubic root of 168814921 is about 552.6755811944.

The spelling of 168814921 in words is "one hundred sixty-eight million, eight hundred fourteen thousand, nine hundred twenty-one".