7881330421 has 2 divisors, whose sum is σ = 7881330422. Its totient is φ = 7881330420.

The previous prime is 7881330419. The next prime is 7881330433. The reversal of 7881330421 is 1240331887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5124555396 + 2756775025 = 71586^2 + 52505^2 .

It is an emirp because it is prime and its reverse (1240331887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7881330421 - 2¹ = 7881330419 is a prime.

Together with 7881330419, 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 (7881330461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3940665210 + 3940665211.

It is an arithmetic number, because the mean of its divisors is an integer number (3940665211).

Almost surely, 2^7881330421 is an apocalyptic number.

It is an amenable number.

7881330421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7881330421 is an equidigital number, since it uses as much as digits as its factorization.

7881330421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 7881330421 is about 88776.8574629672. The cubic root of 7881330421 is about 1990.0615639649.

The spelling of 7881330421 in words is "seven billion, eight hundred eighty-one million, three hundred thirty thousand, four hundred twenty-one".