1143221312 has 28 divisors (see below), whose sum is σ = 2270180880. Its totient is φ = 571207296.

The previous prime is 1143221311. The next prime is 1143221329. The reversal of 1143221312 is 2131223411.

It is a super-2 number, since 2×1143221312² = 2613909936422002688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1143221311) 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, 98639 + ... + 109617.

Almost surely, 2^1143221312 is an apocalyptic number.

It is an amenable number.

1143221312 is a deficient number, since it is larger than the sum of its proper divisors (1126959568).

1143221312 is a wasteful number, since it uses less digits than its factorization.

1143221312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12618 (or 12608 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

The square root of 1143221312 is about 33811.5558943980. Note that the first 3 decimals coincide. The cubic root of 1143221312 is about 1045.6269558748.

Adding to 1143221312 its reverse (2131223411), we get a palindrome (3274444723).

The spelling of 1143221312 in words is "one billion, one hundred forty-three million, two hundred twenty-one thousand, three hundred twelve".