143221331 has 4 divisors (see below), whose sum is σ = 156241464. Its totient is φ = 130201200.

The previous prime is 143221303. The next prime is 143221349. The reversal of 143221331 is 133122341.

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 143221331 - 2¹⁴ = 143204947 is a prime.

It is a super-2 number, since 2×143221331² = 41024699306823122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (143220331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6510050 + ... + 6510071.

It is an arithmetic number, because the mean of its divisors is an integer number (39060366).

Almost surely, 2^143221331 is an apocalyptic number.

143221331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

143221331 is a deficient number, since it is larger than the sum of its proper divisors (13020133).

143221331 is a wasteful number, since it uses less digits than its factorization.

143221331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13020132.

The product of its digits is 432, while the sum is 20.

The square root of 143221331 is about 11967.5114790001. The cubic root of 143221331 is about 523.2018068683.

Adding to 143221331 its reverse (133122341), we get a palindrome (276343672).

The spelling of 143221331 in words is "one hundred forty-three million, two hundred twenty-one thousand, three hundred thirty-one".