6339400421 has 2 divisors, whose sum is σ = 6339400422. Its totient is φ = 6339400420.

The previous prime is 6339400399. The next prime is 6339400427. The reversal of 6339400421 is 1240049336.

6339400421 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., 6282940225 + 56460196 = 79265^2 + 7514^2 .

It is a cyclic number.

It is not a de Polignac number, because 6339400421 - 2⁶ = 6339400357 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6339400427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3169700210 + 3169700211.

It is an arithmetic number, because the mean of its divisors is an integer number (3169700211).

Almost surely, 2^6339400421 is an apocalyptic number.

It is an amenable number.

6339400421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6339400421 is an equidigital number, since it uses as much as digits as its factorization.

6339400421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 6339400421 is about 79620.3518015338. The cubic root of 6339400421 is about 1850.7569749554.

Adding to 6339400421 its reverse (1240049336), we get a palindrome (7579449757).

The spelling of 6339400421 in words is "six billion, three hundred thirty-nine million, four hundred thousand, four hundred twenty-one".