143221312 has 56 divisors (see below), whose sum is σ = 310083200. Its totient is φ = 65235456.

The previous prime is 143221303. The next prime is 143221349. The reversal of 143221312 is 213122341.

It is a happy number.

It is a super-2 number, since 2×143221312² = 41024688422002688, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 143221312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64639 + ... + 66817.

It is an arithmetic number, because the mean of its divisors is an integer number (5537200).

Almost surely, 2^143221312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 143221312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155041600).

143221312 is an abundant number, since it is smaller than the sum of its proper divisors (166861888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

143221312 is a wasteful number, since it uses less digits than its factorization.

143221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2283 (or 2273 counting only the distinct ones).

The product of its digits is 288, while the sum is 19.

The square root of 143221312 is about 11967.5106851843. The cubic root of 143221312 is about 523.2017837320.

Adding to 143221312 its reverse (213122341), we get a palindrome (356343653).

The spelling of 143221312 in words is "one hundred forty-three million, two hundred twenty-one thousand, three hundred twelve".