6788219721 has 4 divisors (see below), whose sum is σ = 9050959632. Its totient is φ = 4525479812.

The previous prime is 6788219719. The next prime is 6788219741. The reversal of 6788219721 is 1279128876.

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 6788219721 - 2¹ = 6788219719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6788219741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1131369951 + ... + 1131369956.

It is an arithmetic number, because the mean of its divisors is an integer number (2262739908).

Almost surely, 2^6788219721 is an apocalyptic number.

It is an amenable number.

6788219721 is a deficient number, since it is larger than the sum of its proper divisors (2262739911).

6788219721 is a wasteful number, since it uses less digits than its factorization.

6788219721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2262739910.

The product of its digits is 677376, while the sum is 51.

The square root of 6788219721 is about 82390.6531167219. The cubic root of 6788219721 is about 1893.4418141456.

The spelling of 6788219721 in words is "six billion, seven hundred eighty-eight million, two hundred nineteen thousand, seven hundred twenty-one".