1143343021 has 4 divisors (see below), whose sum is σ = 1143433692. Its totient is φ = 1143252352.

The previous prime is 1143343013. The next prime is 1143343051. The reversal of 1143343021 is 1203433411.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1203433411 = 3539 ⋅340049.

It can be written as a sum of positive squares in 2 ways, for example, as 728406121 + 414936900 = 26989^2 + 20370^2 .

It is a cyclic number.

It is not a de Polignac number, because 1143343021 - 2³ = 1143343013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1143342983 and 1143343001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143343051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22630 + ... + 52903.

It is an arithmetic number, because the mean of its divisors is an integer number (285858423).

Almost surely, 2^1143343021 is an apocalyptic number.

It is an amenable number.

1143343021 is a deficient number, since it is larger than the sum of its proper divisors (90671).

1143343021 is an equidigital number, since it uses as much as digits as its factorization.

1143343021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90670.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1143343021 is about 33813.3556601530. The cubic root of 1143343021 is about 1045.6640608792.

Adding to 1143343021 its reverse (1203433411), we get a palindrome (2346776432).

The spelling of 1143343021 in words is "one billion, one hundred forty-three million, three hundred forty-three thousand, twenty-one".