6708281221 has 4 divisors (see below), whose sum is σ = 6723424512. Its totient is φ = 6693137932.

The previous prime is 6708281213. The next prime is 6708281249. The reversal of 6708281221 is 1221828076.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6708281221 - 2³ = 6708281213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6708281201) by changing a digit.

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, 7570981 + ... + 7571866.

It is an arithmetic number, because the mean of its divisors is an integer number (1680856128).

Almost surely, 2^6708281221 is an apocalyptic number.

It is an amenable number.

6708281221 is a deficient number, since it is larger than the sum of its proper divisors (15143291).

6708281221 is a wasteful number, since it uses less digits than its factorization.

6708281221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15143290.

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 6708281221 is about 81904.0977057925. The cubic root of 6708281221 is about 1885.9800171025.

The spelling of 6708281221 in words is "six billion, seven hundred eight million, two hundred eighty-one thousand, two hundred twenty-one".