221433412 has 6 divisors (see below), whose sum is σ = 387508478. Its totient is φ = 110716704.

The previous prime is 221433389. The next prime is 221433427. The reversal of 221433412 is 214334122.

It can be written as a sum of positive squares in only one way, i.e., 216207616 + 5225796 = 14704^2 + 2286^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27679173 + ... + 27679180.

Almost surely, 2^221433412 is an apocalyptic number.

It is an amenable number.

221433412 is a deficient number, since it is larger than the sum of its proper divisors (166075066).

221433412 is a wasteful number, since it uses less digits than its factorization.

221433412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55358357 (or 55358355 counting only the distinct ones).

The product of its digits is 1152, while the sum is 22.

The square root of 221433412 is about 14880.6388303728. The cubic root of 221433412 is about 604.9893329631.

Adding to 221433412 its reverse (214334122), we get a palindrome (435767534).

It can be divided in two parts, 2 and 21433412, that multiplied together give a palindrome (42866824).

The spelling of 221433412 in words is "two hundred twenty-one million, four hundred thirty-three thousand, four hundred twelve".