143224221 has 16 divisors (see below), whose sum is σ = 218537984. Its totient is φ = 81733104.

The previous prime is 143224199. The next prime is 143224231. The reversal of 143224221 is 122422341.

143224221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 143224221 - 2²⁶ = 76115357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143224231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13140 + ... + 21426.

It is an arithmetic number, because the mean of its divisors is an integer number (13658624).

Almost surely, 2^143224221 is an apocalyptic number.

It is an amenable number.

143224221 is a deficient number, since it is larger than the sum of its proper divisors (75313763).

143224221 is an equidigital number, since it uses as much as digits as its factorization.

143224221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9120.

The product of its digits is 768, while the sum is 21.

The square root of 143224221 is about 11967.6322219560. The cubic root of 143224221 is about 523.2053259974.

Adding to 143224221 its reverse (122422341), we get a palindrome (265646562).

The spelling of 143224221 in words is "one hundred forty-three million, two hundred twenty-four thousand, two hundred twenty-one".