6740403421 has 2 divisors, whose sum is σ = 6740403422. Its totient is φ = 6740403420.

The previous prime is 6740403413. The next prime is 6740403427. The reversal of 6740403421 is 1243040476.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6336956025 + 403447396 = 79605^2 + 20086^2 .

It is a cyclic number.

It is not a de Polignac number, because 6740403421 - 2³ = 6740403413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6740403427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3370201710 + 3370201711.

It is an arithmetic number, because the mean of its divisors is an integer number (3370201711).

Almost surely, 2^6740403421 is an apocalyptic number.

It is an amenable number.

6740403421 is a deficient number, since it is larger than the sum of its proper divisors (1).

6740403421 is an equidigital number, since it uses as much as digits as its factorization.

6740403421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 6740403421 is about 82099.9599329987. The cubic root of 6740403421 is about 1888.9855254813.

Adding to 6740403421 its reverse (1243040476), we get a palindrome (7983443897).

The spelling of 6740403421 in words is "six billion, seven hundred forty million, four hundred three thousand, four hundred twenty-one".