6921971 has 8 divisors (see below), whose sum is σ = 8029440. Its totient is φ = 5844168.

The previous prime is 6921961. The next prime is 6922001. The reversal of 6921971 is 1791296.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6921971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6921961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6911 + ... + 7848.

It is an arithmetic number, because the mean of its divisors is an integer number (1003680).

Almost surely, 2^6921971 is an apocalyptic number.

6921971 is a deficient number, since it is larger than the sum of its proper divisors (1107469).

6921971 is a wasteful number, since it uses less digits than its factorization.

6921971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14833.

The product of its digits is 6804, while the sum is 35.

The square root of 6921971 is about 2630.9638918085. The cubic root of 6921971 is about 190.5796793093.

The spelling of 6921971 in words is "six million, nine hundred twenty-one thousand, nine hundred seventy-one".