163443421 has 4 divisors (see below), whose sum is σ = 163623744. Its totient is φ = 163263100.

The previous prime is 163443409. The next prime is 163443433. The reversal of 163443421 is 124344361.

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 an interprime number because it is at equal distance from previous prime (163443409) and next prime (163443433).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163443421 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 163443421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163443121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88795 + ... + 90616.

It is an arithmetic number, because the mean of its divisors is an integer number (40905936).

Almost surely, 2^163443421 is an apocalyptic number.

It is an amenable number.

163443421 is a deficient number, since it is larger than the sum of its proper divisors (180323).

163443421 is an equidigital number, since it uses as much as digits as its factorization.

163443421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180322.

The product of its digits is 6912, while the sum is 28.

The square root of 163443421 is about 12784.4992471352. The cubic root of 163443421 is about 546.7504484833.

Adding to 163443421 its reverse (124344361), we get a palindrome (287787782).

The spelling of 163443421 in words is "one hundred sixty-three million, four hundred forty-three thousand, four hundred twenty-one".