6921427 has 4 divisors (see below), whose sum is σ = 7009120. Its totient is φ = 6833736.

The previous prime is 6921403. The next prime is 6921437. The reversal of 6921427 is 7241296.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6921427 - 2¹¹ = 6919379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6921437) 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 in 3 ways as a sum of consecutive naturals, for example, 43728 + ... + 43885.

It is an arithmetic number, because the mean of its divisors is an integer number (1752280).

Almost surely, 2^6921427 is an apocalyptic number.

6921427 is a deficient number, since it is larger than the sum of its proper divisors (87693).

6921427 is an equidigital number, since it uses as much as digits as its factorization.

6921427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87692.

The product of its digits is 6048, while the sum is 31.

The square root of 6921427 is about 2630.8605056141. The cubic root of 6921427 is about 190.5746866050.

The spelling of 6921427 in words is "six million, nine hundred twenty-one thousand, four hundred twenty-seven".