143204221 has 4 divisors (see below), whose sum is σ = 147823744. Its totient is φ = 138584700.

The previous prime is 143204207. The next prime is 143204239. The reversal of 143204221 is 122402341.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122402341 = 83 ⋅1474727.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143204221 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 (143204261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2309715 + ... + 2309776.

It is an arithmetic number, because the mean of its divisors is an integer number (36955936).

Almost surely, 2^143204221 is an apocalyptic number.

It is an amenable number.

143204221 is a deficient number, since it is larger than the sum of its proper divisors (4619523).

143204221 is an equidigital number, since it uses as much as digits as its factorization.

143204221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4619522.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 143204221 is about 11966.7966056084. The cubic root of 143204221 is about 523.1809711931.

Adding to 143204221 its reverse (122402341), we get a palindrome (265606562).

The spelling of 143204221 in words is "one hundred forty-three million, two hundred four thousand, two hundred twenty-one".