9128376421 has 2 divisors, whose sum is σ = 9128376422. Its totient is φ = 9128376420.

The previous prime is 9128376419. The next prime is 9128376463. The reversal of 9128376421 is 1246738219.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9122924196 + 5452225 = 95514^2 + 2335^2 .

It is a cyclic number.

It is not a de Polignac number, because 9128376421 - 2¹ = 9128376419 is a prime.

Together with 9128376419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9128376721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4564188210 + 4564188211.

It is an arithmetic number, because the mean of its divisors is an integer number (4564188211).

Almost surely, 2^9128376421 is an apocalyptic number.

It is an amenable number.

9128376421 is a deficient number, since it is larger than the sum of its proper divisors (1).

9128376421 is an equidigital number, since it uses as much as digits as its factorization.

9128376421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 43.

The square root of 9128376421 is about 95542.5372334229. The cubic root of 9128376421 is about 2089.9273053781.

The spelling of 9128376421 in words is "nine billion, one hundred twenty-eight million, three hundred seventy-six thousand, four hundred twenty-one".