7774828421 has 2 divisors, whose sum is σ = 7774828422. Its totient is φ = 7774828420.

The previous prime is 7774828403. The next prime is 7774828423. The reversal of 7774828421 is 1248284777.

7774828421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6111330625 + 1663497796 = 78175^2 + 40786^2 .

It is a cyclic number.

It is not a de Polignac number, because 7774828421 - 2³⁰ = 6701086597 is a prime.

Together with 7774828423, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7774828421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7774828423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3887414210 + 3887414211.

It is an arithmetic number, because the mean of its divisors is an integer number (3887414211).

Almost surely, 2^7774828421 is an apocalyptic number.

It is an amenable number.

7774828421 is a deficient number, since it is larger than the sum of its proper divisors (1).

7774828421 is an equidigital number, since it uses as much as digits as its factorization.

7774828421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1404928, while the sum is 50.

The square root of 7774828421 is about 88174.9875021256. The cubic root of 7774828421 is about 1981.0568466896.

The spelling of 7774828421 in words is "seven billion, seven hundred seventy-four million, eight hundred twenty-eight thousand, four hundred twenty-one".