1263330421 has 2 divisors, whose sum is σ = 1263330422. Its totient is φ = 1263330420.

The previous prime is 1263330413. The next prime is 1263330433. The reversal of 1263330421 is 1240333621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1109223025 + 154107396 = 33305^2 + 12414^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263330421 - 2³ = 1263330413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1263330491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631665210 + 631665211.

It is an arithmetic number, because the mean of its divisors is an integer number (631665211).

Almost surely, 2^1263330421 is an apocalyptic number.

It is an amenable number.

1263330421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263330421 is an equidigital number, since it uses as much as digits as its factorization.

1263330421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 1263330421 is about 35543.3597314604. The cubic root of 1263330421 is about 1081.0330824124.

The spelling of 1263330421 in words is "one billion, two hundred sixty-three million, three hundred thirty thousand, four hundred twenty-one".