163304021 has 4 divisors (see below), whose sum is σ = 164344332. Its totient is φ = 162263712.

The previous prime is 163303957. The next prime is 163304039. The reversal of 163304021 is 120403361.

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 87422500 + 75881521 = 9350^2 + 8711^2 .

It is a cyclic number.

It is not a de Polignac number, because 163304021 - 2⁶ = 163303957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163303984 and 163304002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163304041) 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, 519920 + ... + 520233.

It is an arithmetic number, because the mean of its divisors is an integer number (41086083).

Almost surely, 2^163304021 is an apocalyptic number.

It is an amenable number.

163304021 is a deficient number, since it is larger than the sum of its proper divisors (1040311).

163304021 is a wasteful number, since it uses less digits than its factorization.

163304021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040310.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 163304021 is about 12779.0461694134. The cubic root of 163304021 is about 546.5949641151.

Adding to 163304021 its reverse (120403361), we get a palindrome (283707382).

The spelling of 163304021 in words is "one hundred sixty-three million, three hundred four thousand, twenty-one".