163421500 has 96 divisors (see below), whose sum is σ = 398990592. Its totient is φ = 57960000.

The previous prime is 163421497. The next prime is 163421507. The reversal of 163421500 is 5124361.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163421507) 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 31 ways as a sum of consecutive naturals, for example, 236155 + ... + 236845.

It is an arithmetic number, because the mean of its divisors is an integer number (4156152).

Almost surely, 2^163421500 is an apocalyptic number.

163421500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163421500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199495296).

163421500 is an abundant number, since it is smaller than the sum of its proper divisors (235569092).

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

163421500 is a wasteful number, since it uses less digits than its factorization.

163421500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764 (or 752 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 163421500 is about 12783.6418911044. The cubic root of 163421500 is about 546.7260040356.

Adding to 163421500 its reverse (5124361), we get a palindrome (168545861).

The spelling of 163421500 in words is "one hundred sixty-three million, four hundred twenty-one thousand, five hundred".