6921243 has 24 divisors (see below), whose sum is σ = 11619296. Its totient is φ = 3888000.

The previous prime is 6921223. The next prime is 6921247. The reversal of 6921243 is 3421296.

It is not a de Polignac number, because 6921243 - 2⁶ = 6921179 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6921247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2943 + ... + 4743.

Almost surely, 2^6921243 is an apocalyptic number.

6921243 is a gapful number since it is divisible by the number (63) formed by its first and last digit.

6921243 is a deficient number, since it is larger than the sum of its proper divisors (4698053).

6921243 is a wasteful number, since it uses less digits than its factorization.

6921243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1875 (or 1872 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 6921243 is about 2630.8255358347. The cubic root of 6921243 is about 190.5729978370.

It can be divided in two parts, 69 and 21243, that added together give a palindrome (21312).

The spelling of 6921243 in words is "six million, nine hundred twenty-one thousand, two hundred forty-three".