163340421 has 4 divisors (see below), whose sum is σ = 217787232. Its totient is φ = 108893612.

The previous prime is 163340417. The next prime is 163340447. The reversal of 163340421 is 124043361.

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 163340421 - 2² = 163340417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 163340391 and 163340400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163340491) 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, 27223401 + ... + 27223406.

It is an arithmetic number, because the mean of its divisors is an integer number (54446808).

Almost surely, 2^163340421 is an apocalyptic number.

It is an amenable number.

163340421 is a deficient number, since it is larger than the sum of its proper divisors (54446811).

163340421 is an equidigital number, since it uses as much as digits as its factorization.

163340421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54446810.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 163340421 is about 12780.4702965110. The cubic root of 163340421 is about 546.6355725837.

Adding to 163340421 its reverse (124043361), we get a palindrome (287383782).

The spelling of 163340421 in words is "one hundred sixty-three million, three hundred forty thousand, four hundred twenty-one".