1421043391 has 2 divisors, whose sum is σ = 1421043392. Its totient is φ = 1421043390.

The previous prime is 1421043361. The next prime is 1421043443. The reversal of 1421043391 is 1933401241.

It is a weak prime.

It is an emirp because it is prime and its reverse (1933401241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1421043391 - 2⁵ = 1421043359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421043301) 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, 710521695 + 710521696.

It is an arithmetic number, because the mean of its divisors is an integer number (710521696).

Almost surely, 2^1421043391 is an apocalyptic number.

1421043391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421043391 is an equidigital number, since it uses as much as digits as its factorization.

1421043391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1421043391 is about 37696.7291817208. The cubic root of 1421043391 is about 1124.2660934470.

The spelling of 1421043391 in words is "one billion, four hundred twenty-one million, forty-three thousand, three hundred ninety-one".