221336836 has 12 divisors (see below), whose sum is σ = 442673728. Its totient is φ = 94858632.

The previous prime is 221336827. The next prime is 221336837. The reversal of 221336836 is 638633122.

221336836 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (221336837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3952416 + ... + 3952471.

Almost surely, 2^221336836 is an apocalyptic number.

It is an amenable number.

221336836 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221336836 is a wasteful number, since it uses less digits than its factorization.

221336836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7904898 (or 7904896 counting only the distinct ones).

The product of its digits is 31104, while the sum is 34.

The square root of 221336836 is about 14877.3934545000. The cubic root of 221336836 is about 604.9013667953.

Adding to 221336836 its reverse (638633122), we get a palindrome (859969958).

The spelling of 221336836 in words is "two hundred twenty-one million, three hundred thirty-six thousand, eight hundred thirty-six".