1421310521 has 2 divisors, whose sum is σ = 1421310522. Its totient is φ = 1421310520.

The previous prime is 1421310491. The next prime is 1421310529. The reversal of 1421310521 is 1250131241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1289887225 + 131423296 = 35915^2 + 11464^2 .

It is an emirp because it is prime and its reverse (1250131241) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1421310521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1421310493 and 1421310502.

It is not a weakly prime, because it can be changed into another prime (1421310529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710655260 + 710655261.

It is an arithmetic number, because the mean of its divisors is an integer number (710655261).

Almost surely, 2^1421310521 is an apocalyptic number.

It is an amenable number.

1421310521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421310521 is an equidigital number, since it uses as much as digits as its factorization.

1421310521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1421310521 is about 37700.2721608213. The cubic root of 1421310521 is about 1124.3365361436.

Adding to 1421310521 its reverse (1250131241), we get a palindrome (2671441762).

The spelling of 1421310521 in words is "one billion, four hundred twenty-one million, three hundred ten thousand, five hundred twenty-one".