1421330021 has 2 divisors, whose sum is σ = 1421330022. Its totient is φ = 1421330020.

The previous prime is 1421330003. The next prime is 1421330059. The reversal of 1421330021 is 1200331241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1388680225 + 32649796 = 37265^2 + 5714^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421330021 - 2²² = 1417135717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1421330081) 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, 710665010 + 710665011.

It is an arithmetic number, because the mean of its divisors is an integer number (710665011).

Almost surely, 2^1421330021 is an apocalyptic number.

It is an amenable number.

1421330021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421330021 is an equidigital number, since it uses as much as digits as its factorization.

1421330021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1421330021 is about 37700.5307787569. The cubic root of 1421330021 is about 1124.3416779855.

Adding to 1421330021 its reverse (1200331241), we get a palindrome (2621661262).

The spelling of 1421330021 in words is "one billion, four hundred twenty-one million, three hundred thirty thousand, twenty-one".