221012433 has 24 divisors (see below), whose sum is σ = 330930600. Its totient is φ = 142020864.

The previous prime is 221012417. The next prime is 221012437. The reversal of 221012433 is 334210122.

221012433 is a `hidden beast` number, since 221 + 0 + 12 + 433 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 65561409 + 155451024 = 8097^2 + 12468^2 .

It is not a de Polignac number, because 221012433 - 2⁴ = 221012417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221012437) by changing a digit.

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 in 23 ways as a sum of consecutive naturals, for example, 33253 + ... + 39341.

It is an arithmetic number, because the mean of its divisors is an integer number (13788775).

Almost surely, 2^221012433 is an apocalyptic number.

It is an amenable number.

221012433 is a deficient number, since it is larger than the sum of its proper divisors (109918167).

221012433 is a wasteful number, since it uses less digits than its factorization.

221012433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6241 (or 6238 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 221012433 is about 14866.4869084798. The cubic root of 221012433 is about 604.6056971287.

Adding to 221012433 its reverse (334210122), we get a palindrome (555222555).

It can be divided in two parts, 221012 and 433, that added together give a triangular number (221445 = T₆₆₅).

The spelling of 221012433 in words is "two hundred twenty-one million, twelve thousand, four hundred thirty-three".