221012533 has 12 divisors (see below), whose sum is σ = 255874080. Its totient is φ = 187004376.

The previous prime is 221012521. The next prime is 221012551. The reversal of 221012533 is 335210122.

It is not a de Polignac number, because 221012533 - 2⁵ = 221012501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221012533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012513) 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 11 ways as a sum of consecutive naturals, for example, 41158 + ... + 46216.

It is an arithmetic number, because the mean of its divisors is an integer number (21322840).

Almost surely, 2^221012533 is an apocalyptic number.

It is an amenable number.

221012533 is a deficient number, since it is larger than the sum of its proper divisors (34861547).

221012533 is an frugal number, since it uses more digits than its factorization.

221012533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5224 (or 5145 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 221012533 is about 14866.4902717487. The cubic root of 221012533 is about 604.6057883160.

Adding to 221012533 its reverse (335210122), we get a palindrome (556222655).

The spelling of 221012533 in words is "two hundred twenty-one million, twelve thousand, five hundred thirty-three".