1421321393 has 2 divisors, whose sum is σ = 1421321394. Its totient is φ = 1421321392.

The previous prime is 1421321347. The next prime is 1421321401. The reversal of 1421321393 is 3931231241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 813846784 + 607474609 = 28528^2 + 24647^2 .

It is a cyclic number.

It is not a de Polignac number, because 1421321393 - 2⁸ = 1421321137 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1421321303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710660696 + 710660697.

It is an arithmetic number, because the mean of its divisors is an integer number (710660697).

Almost surely, 2^1421321393 is an apocalyptic number.

It is an amenable number.

1421321393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421321393 is an equidigital number, since it uses as much as digits as its factorization.

1421321393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 29.

The square root of 1421321393 is about 37700.4163504861. The cubic root of 1421321393 is about 1124.3394029240.

The spelling of 1421321393 in words is "one billion, four hundred twenty-one million, three hundred twenty-one thousand, three hundred ninety-three".