163420621 has 16 divisors (see below), whose sum is σ = 201487104. Its totient is φ = 129072384.

The previous prime is 163420613. The next prime is 163420633. The reversal of 163420621 is 126024361.

It is not a de Polignac number, because 163420621 - 2³ = 163420613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163420661) 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 in 15 ways as a sum of consecutive naturals, for example, 66405 + ... + 68821.

It is an arithmetic number, because the mean of its divisors is an integer number (12592944).

Almost surely, 2^163420621 is an apocalyptic number.

It is an amenable number.

163420621 is a deficient number, since it is larger than the sum of its proper divisors (38066483).

163420621 is a wasteful number, since it uses less digits than its factorization.

163420621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3180.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 163420621 is about 12783.6075111840. The cubic root of 163420621 is about 546.7250238035.

Adding to 163420621 its reverse (126024361), we get a palindrome (289444982).

The spelling of 163420621 in words is "one hundred sixty-three million, four hundred twenty thousand, six hundred twenty-one".