163421404 has 6 divisors (see below), whose sum is σ = 285987464. Its totient is φ = 81710700.

The previous prime is 163421329. The next prime is 163421407. The reversal of 163421404 is 404124361.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163421407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20427672 + ... + 20427679.

Almost surely, 2^163421404 is an apocalyptic number.

It is an amenable number.

163421404 is a deficient number, since it is larger than the sum of its proper divisors (122566060).

163421404 is a wasteful number, since it uses less digits than its factorization.

163421404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40855355 (or 40855353 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 163421404 is about 12783.6381363053. The cubic root of 163421404 is about 546.7258969797.

Adding to 163421404 its reverse (404124361), we get a palindrome (567545765).

The spelling of 163421404 in words is "one hundred sixty-three million, four hundred twenty-one thousand, four hundred four".