221330143 has 4 divisors (see below), whose sum is σ = 224958568. Its totient is φ = 217701720.

The previous prime is 221330141. The next prime is 221330147. The reversal of 221330143 is 341033122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 341033122 = 2 ⋅170516561.

It is a cyclic number.

It is not a de Polignac number, because 221330143 - 2¹ = 221330141 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221330143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221330141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1814121 + ... + 1814242.

It is an arithmetic number, because the mean of its divisors is an integer number (56239642).

Almost surely, 2^221330143 is an apocalyptic number.

221330143 is a deficient number, since it is larger than the sum of its proper divisors (3628425).

221330143 is an equidigital number, since it uses as much as digits as its factorization.

221330143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3628424.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 221330143 is about 14877.1685142032. The cubic root of 221330143 is about 604.8952695338.

Adding to 221330143 its reverse (341033122), we get a palindrome (562363265).

The spelling of 221330143 in words is "two hundred twenty-one million, three hundred thirty thousand, one hundred forty-three".