6921971269715 has 4 divisors (see below), whose sum is σ = 8306365523664. Its totient is φ = 5537577015768.

The previous prime is 6921971269709. The next prime is 6921971269723. The reversal of 6921971269715 is 5179621791296.

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 6921971269715 - 2¹² = 6921971265619 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 692197126967 + ... + 692197126976.

It is an arithmetic number, because the mean of its divisors is an integer number (2076591380916).

Almost surely, 2^{6921971269715} is an apocalyptic number.

6921971269715 is a deficient number, since it is larger than the sum of its proper divisors (1384394253949).

6921971269715 is a wasteful number, since it uses less digits than its factorization.

6921971269715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384394253948.

The product of its digits is 25719120, while the sum is 65.

The spelling of 6921971269715 in words is "six trillion, nine hundred twenty-one billion, nine hundred seventy-one million, two hundred sixty-nine thousand, seven hundred fifteen".