221135143 has 4 divisors (see below), whose sum is σ = 221539960. Its totient is φ = 220730328.

The previous prime is 221135137. The next prime is 221135147. The reversal of 221135143 is 341531122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221135143 - 2¹³ = 221126951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221135147) 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 3 ways as a sum of consecutive naturals, for example, 201588 + ... + 202681.

It is an arithmetic number, because the mean of its divisors is an integer number (55384990).

Almost surely, 2^221135143 is an apocalyptic number.

221135143 is a deficient number, since it is larger than the sum of its proper divisors (404817).

221135143 is an equidigital number, since it uses as much as digits as its factorization.

221135143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404816.

The product of its digits is 720, while the sum is 22.

The square root of 221135143 is about 14870.6134036226. The cubic root of 221135143 is about 604.7175723410.

Adding to 221135143 its reverse (341531122), we get a palindrome (562666265).

The spelling of 221135143 in words is "two hundred twenty-one million, one hundred thirty-five thousand, one hundred forty-three".