221147733 has 8 divisors (see below), whose sum is σ = 298903168. Its totient is φ = 145412064.

The previous prime is 221147711. The next prime is 221147741. The reversal of 221147733 is 337741122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221147733 - 2⁵ = 221147701 is a prime.

It is a super-2 number, since 2×221147733² = 97812639622078578, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221147733.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221147743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504685 + ... + 505122.

It is an arithmetic number, because the mean of its divisors is an integer number (37362896).

Almost surely, 2^221147733 is an apocalyptic number.

It is an amenable number.

221147733 is a deficient number, since it is larger than the sum of its proper divisors (77755435).

221147733 is a wasteful number, since it uses less digits than its factorization.

221147733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009883.

The product of its digits is 7056, while the sum is 30.

The square root of 221147733 is about 14871.0367157102. The cubic root of 221147733 is about 604.7290483547.

Adding to 221147733 its reverse (337741122), we get a palindrome (558888855).

The spelling of 221147733 in words is "two hundred twenty-one million, one hundred forty-seven thousand, seven hundred thirty-three".