1143331021 has 4 divisors (see below), whose sum is σ = 1306664032. Its totient is φ = 979998012.

The previous prime is 1143330983. The next prime is 1143331051. The reversal of 1143331021 is 1201333411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1143331021 - 2¹⁷ = 1143199949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1143331021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1143331051) 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, 81666495 + ... + 81666508.

It is an arithmetic number, because the mean of its divisors is an integer number (326666008).

Almost surely, 2^1143331021 is an apocalyptic number.

It is an amenable number.

1143331021 is a deficient number, since it is larger than the sum of its proper divisors (163333011).

1143331021 is an equidigital number, since it uses as much as digits as its factorization.

1143331021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163333010.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1143331021 is about 33813.1782150096. The cubic root of 1143331021 is about 1045.6604025974.

Adding to 1143331021 its reverse (1201333411), we get a palindrome (2344664432).

The spelling of 1143331021 in words is "one billion, one hundred forty-three million, three hundred thirty-one thousand, twenty-one".