221240733 has 24 divisors (see below), whose sum is σ = 347302368. Its totient is φ = 124893216.

The previous prime is 221240729. The next prime is 221240741. The reversal of 221240733 is 337042122.

It is not a de Polignac number, because 221240733 - 2² = 221240729 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221242733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3135 + ... + 21267.

It is an arithmetic number, because the mean of its divisors is an integer number (14470932).

Almost surely, 2^221240733 is an apocalyptic number.

It is an amenable number.

221240733 is a deficient number, since it is larger than the sum of its proper divisors (126061635).

221240733 is a wasteful number, since it uses less digits than its factorization.

221240733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18233 (or 18226 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 221240733 is about 14874.1632705843. The cubic root of 221240733 is about 604.8138060549.

Adding to 221240733 its reverse (337042122), we get a palindrome (558282855).

The spelling of 221240733 in words is "two hundred twenty-one million, two hundred forty thousand, seven hundred thirty-three".