1421505443 has 2 divisors, whose sum is σ = 1421505444. Its totient is φ = 1421505442.

The previous prime is 1421505431. The next prime is 1421505451. The reversal of 1421505443 is 3445051241.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1421505443 - 2²⁰ = 1420456867 is a prime.

It is not a weakly prime, because it can be changed into another prime (1421505493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710752721 + 710752722.

It is an arithmetic number, because the mean of its divisors is an integer number (710752722).

Almost surely, 2^1421505443 is an apocalyptic number.

1421505443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421505443 is an equidigital number, since it uses as much as digits as its factorization.

1421505443 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 29.

The square root of 1421505443 is about 37702.8572259451. The cubic root of 1421505443 is about 1124.3879318813.

Adding to 1421505443 its reverse (3445051241), we get a palindrome (4866556684).

The spelling of 1421505443 in words is "one billion, four hundred twenty-one million, five hundred five thousand, four hundred forty-three".