6400054421 has 2 divisors, whose sum is σ = 6400054422. Its totient is φ = 6400054420.

The previous prime is 6400054369. The next prime is 6400054433. The reversal of 6400054421 is 1244500046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4278991396 + 2121063025 = 65414^2 + 46055^2 .

It is a cyclic number.

It is not a de Polignac number, because 6400054421 - 2⁶ = 6400054357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6400054621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3200027210 + 3200027211.

It is an arithmetic number, because the mean of its divisors is an integer number (3200027211).

Almost surely, 2^6400054421 is an apocalyptic number.

It is an amenable number.

6400054421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6400054421 is an equidigital number, since it uses as much as digits as its factorization.

6400054421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 6400054421 is about 80000.3401305269. The cubic root of 6400054421 is about 1856.6407959282.

Adding to 6400054421 its reverse (1244500046), we get a palindrome (7644554467).

The spelling of 6400054421 in words is "six billion, four hundred million, fifty-four thousand, four hundred twenty-one".