6921023 has 4 divisors (see below), whose sum is σ = 7328160. Its totient is φ = 6513888.

The previous prime is 6921017. The next prime is 6921037. The reversal of 6921023 is 3201296.

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 6921023 - 2⁴ = 6921007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6921023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6921043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203543 + ... + 203576.

It is an arithmetic number, because the mean of its divisors is an integer number (1832040).

Almost surely, 2^6921023 is an apocalyptic number.

6921023 is a deficient number, since it is larger than the sum of its proper divisors (407137).

6921023 is a wasteful number, since it uses less digits than its factorization.

6921023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407136.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 6921023 is about 2630.7837235318. The cubic root of 6921023 is about 190.5709786186.

The spelling of 6921023 in words is "six million, nine hundred twenty-one thousand, twenty-three".