7927687421 has 2 divisors, whose sum is σ = 7927687422. Its totient is φ = 7927687420.

The previous prime is 7927687387. The next prime is 7927687483. The reversal of 7927687421 is 1247867297.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6656764921 + 1270922500 = 81589^2 + 35650^2 .

It is an emirp because it is prime and its reverse (1247867297) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7927687421 - 2¹⁰ = 7927686397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7927687321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3963843710 + 3963843711.

It is an arithmetic number, because the mean of its divisors is an integer number (3963843711).

Almost surely, 2^7927687421 is an apocalyptic number.

It is an amenable number.

7927687421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7927687421 is an equidigital number, since it uses as much as digits as its factorization.

7927687421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2370816, while the sum is 53.

The square root of 7927687421 is about 89037.5618545342. The cubic root of 7927687421 is about 1993.9557033909.

The spelling of 7927687421 in words is "seven billion, nine hundred twenty-seven million, six hundred eighty-seven thousand, four hundred twenty-one".