16163421 has 4 divisors (see below), whose sum is σ = 21551232. Its totient is φ = 10775612.

The previous prime is 16163393. The next prime is 16163423. The reversal of 16163421 is 12436161.

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 16163421 - 2¹⁰ = 16162397 is a prime.

It is a super-2 number, since 2×16163421² = 522512356846482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16163391 and 16163400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16163423) 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, 2693901 + ... + 2693906.

It is an arithmetic number, because the mean of its divisors is an integer number (5387808).

Almost surely, 2^16163421 is an apocalyptic number.

It is an amenable number.

16163421 is a deficient number, since it is larger than the sum of its proper divisors (5387811).

16163421 is an equidigital number, since it uses as much as digits as its factorization.

16163421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5387810.

The product of its digits is 864, while the sum is 24.

The square root of 16163421 is about 4020.3757287099. The cubic root of 16163421 is about 252.8392121000.

Adding to 16163421 its reverse (12436161), we get a palindrome (28599582).

The spelling of 16163421 in words is "sixteen million, one hundred sixty-three thousand, four hundred twenty-one".