1143120321 has 24 divisors (see below), whose sum is σ = 1889284800. Its totient is φ = 652440096.

The previous prime is 1143120311. The next prime is 1143120331. The reversal of 1143120321 is 1230213411.

1143120321 is a `hidden beast` number, since 11 + 431 + 203 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (1143120311) and next prime (1143120331).

It is not a de Polignac number, because 1143120321 - 2⁷ = 1143120193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1143120294 and 1143120303.

It is not an unprimeable number, because it can be changed into a prime (1143120311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 45355 + ... + 65903.

It is an arithmetic number, because the mean of its divisors is an integer number (78720200).

Almost surely, 2^1143120321 is an apocalyptic number.

It is an amenable number.

1143120321 is a deficient number, since it is larger than the sum of its proper divisors (746164479).

1143120321 is a wasteful number, since it uses less digits than its factorization.

1143120321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21445 (or 21442 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1143120321 is about 33810.0624223026. The cubic root of 1143120321 is about 1045.5961650966.

Adding to 1143120321 its reverse (1230213411), we get a palindrome (2373333732).

The spelling of 1143120321 in words is "one billion, one hundred forty-three million, one hundred twenty thousand, three hundred twenty-one".