221143005 has 12 divisors (see below), whose sum is σ = 383314620. Its totient is φ = 117942912.

The previous prime is 221143003. The next prime is 221143007. The reversal of 221143005 is 500341122.

It is an interprime number because it is at equal distance from previous prime (221143003) and next prime (221143007).

It can be written as a sum of positive squares in 2 ways, for example, as 46744569 + 174398436 = 6837^2 + 13206^2 .

It is not a de Polignac number, because 221143005 - 2¹ = 221143003 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221143003) 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 11 ways as a sum of consecutive naturals, for example, 2457100 + ... + 2457189.

It is an arithmetic number, because the mean of its divisors is an integer number (31942885).

Almost surely, 2^221143005 is an apocalyptic number.

It is an amenable number.

221143005 is a deficient number, since it is larger than the sum of its proper divisors (162171615).

221143005 is a wasteful number, since it uses less digits than its factorization.

221143005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4914300 (or 4914297 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 221143005 is about 14870.8777481358. The cubic root of 221143005 is about 604.7247387479.

Adding to 221143005 its reverse (500341122), we get a palindrome (721484127).

The spelling of 221143005 in words is "two hundred twenty-one million, one hundred forty-three thousand, five".