1321042143 has 8 divisors (see below), whose sum is σ = 1762990848. Its totient is φ = 879894104.

The previous prime is 1321042057. The next prime is 1321042201. The reversal of 1321042143 is 3412401231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321042143 - 2¹⁷ = 1320911071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321046143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196305 + ... + 202922.

It is an arithmetic number, because the mean of its divisors is an integer number (220373856).

Almost surely, 2^1321042143 is an apocalyptic number.

1321042143 is a deficient number, since it is larger than the sum of its proper divisors (441948705).

1321042143 is a wasteful number, since it uses less digits than its factorization.

1321042143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400333.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1321042143 is about 36346.1434405358. The cubic root of 1321042143 is about 1097.2499190301.

Adding to 1321042143 its reverse (3412401231), we get a palindrome (4733443374).

The spelling of 1321042143 in words is "one billion, three hundred twenty-one million, forty-two thousand, one hundred forty-three".