1321223143 has 2 divisors, whose sum is σ = 1321223144. Its totient is φ = 1321223142.

The previous prime is 1321223107. The next prime is 1321223147. The reversal of 1321223143 is 3413221231.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1321223143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321223147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660611571 + 660611572.

It is an arithmetic number, because the mean of its divisors is an integer number (660611572).

Almost surely, 2^1321223143 is an apocalyptic number.

1321223143 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321223143 is an equidigital number, since it uses as much as digits as its factorization.

1321223143 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1321223143 is about 36348.6333030556. The cubic root of 1321223143 is about 1097.3000292572.

Adding to 1321223143 its reverse (3413221231), we get a palindrome (4734444374).

The spelling of 1321223143 in words is "one billion, three hundred twenty-one million, two hundred twenty-three thousand, one hundred forty-three".