1321043923 has 2 divisors, whose sum is σ = 1321043924. Its totient is φ = 1321043922.

The previous prime is 1321043887. The next prime is 1321043929. The reversal of 1321043923 is 3293401231.

It is a strong prime.

It is an emirp because it is prime and its reverse (3293401231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321043923 - 2²¹ = 1318946771 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1321043891 and 1321043900.

It is not a weakly prime, because it can be changed into another prime (1321043929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660521961 + 660521962.

It is an arithmetic number, because the mean of its divisors is an integer number (660521962).

Almost surely, 2^1321043923 is an apocalyptic number.

1321043923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321043923 is an equidigital number, since it uses as much as digits as its factorization.

1321043923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 1321043923 is about 36346.1679273070. The cubic root of 1321043923 is about 1097.2504118490.

The spelling of 1321043923 in words is "one billion, three hundred twenty-one million, forty-three thousand, nine hundred twenty-three".