163221536 has 12 divisors (see below), whose sum is σ = 321342462. Its totient is φ = 81610752.

The previous prime is 163221523. The next prime is 163221551. The reversal of 163221536 is 635122361.

It can be written as a sum of positive squares in only one way, i.e., 162307600 + 913936 = 12740^2 + 956^2 .

It is a junction number, because it is equal to n+sod(n) for n = 163221499 and 163221508.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2550305 + ... + 2550368.

Almost surely, 2^163221536 is an apocalyptic number.

163221536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

163221536 is a deficient number, since it is larger than the sum of its proper divisors (158120926).

163221536 is an equidigital number, since it uses as much as digits as its factorization.

163221536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5100683 (or 5100675 counting only the distinct ones).

The product of its digits is 6480, while the sum is 29.

The square root of 163221536 is about 12775.8184082273. The cubic root of 163221536 is about 546.5029200890.

Adding to 163221536 its reverse (635122361), we get a palindrome (798343897).

The spelling of 163221536 in words is "one hundred sixty-three million, two hundred twenty-one thousand, five hundred thirty-six".