6721427 has 2 divisors, whose sum is σ = 6721428. Its totient is φ = 6721426.

The previous prime is 6721411. The next prime is 6721433. The reversal of 6721427 is 7241276.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6721427 - 2⁴ = 6721411 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6721427.

It is not a weakly prime, because it can be changed into another prime (6721447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3360713 + 3360714.

It is an arithmetic number, because the mean of its divisors is an integer number (3360714).

Almost surely, 2^6721427 is an apocalyptic number.

6721427 is a deficient number, since it is larger than the sum of its proper divisors (1).

6721427 is an equidigital number, since it uses as much as digits as its factorization.

6721427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 29.

The square root of 6721427 is about 2592.5715033534. The cubic root of 6721427 is about 188.7211157064.

The spelling of 6721427 in words is "six million, seven hundred twenty-one thousand, four hundred twenty-seven".