163421128 has 64 divisors (see below), whose sum is σ = 349977600. Its totient is φ = 70917120.

The previous prime is 163421117. The next prime is 163421149. The reversal of 163421128 is 821124361.

It is a junction number, because it is equal to n+sod(n) for n = 163421096 and 163421105.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 377200 + ... + 377632.

It is an arithmetic number, because the mean of its divisors is an integer number (5468400).

Almost surely, 2^163421128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163421128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174988800).

163421128 is an abundant number, since it is smaller than the sum of its proper divisors (186556472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

163421128 is a wasteful number, since it uses less digits than its factorization.

163421128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662 (or 658 counting only the distinct ones).

The product of its digits is 2304, while the sum is 28.

The square root of 163421128 is about 12783.6273412518. The cubic root of 163421128 is about 546.7255891938.

Adding to 163421128 its reverse (821124361), we get a palindrome (984545489).

The spelling of 163421128 in words is "one hundred sixty-three million, four hundred twenty-one thousand, one hundred twenty-eight".