6743339921 has 4 divisors (see below), whose sum is σ = 6764884452. Its totient is φ = 6721795392.

The previous prime is 6743339891. The next prime is 6743339929. The reversal of 6743339921 is 1299333476.

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

It can be written as a sum of positive squares in 2 ways, for example, as 57988225 + 6685351696 = 7615^2 + 81764^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6743339921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6743339929) 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, 10771796 + ... + 10772421.

It is an arithmetic number, because the mean of its divisors is an integer number (1691221113).

Almost surely, 2^6743339921 is an apocalyptic number.

It is an amenable number.

6743339921 is a deficient number, since it is larger than the sum of its proper divisors (21544531).

6743339921 is a wasteful number, since it uses less digits than its factorization.

6743339921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21544530.

The product of its digits is 734832, while the sum is 47.

The square root of 6743339921 is about 82117.8416728058. The cubic root of 6743339921 is about 1889.2598018767.

The spelling of 6743339921 in words is "six billion, seven hundred forty-three million, three hundred thirty-nine thousand, nine hundred twenty-one".