6720151005721 has 4 divisors (see below), whose sum is σ = 6720242055952. Its totient is φ = 6720059955492.

The previous prime is 6720151005653. The next prime is 6720151005769. The reversal of 6720151005721 is 1275001510276.

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 6720151005721 - 2⁹ = 6720151005209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6720151005121) 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, 45414315 + ... + 45562048.

It is an arithmetic number, because the mean of its divisors is an integer number (1680060513988).

Almost surely, 2^{6720151005721} is an apocalyptic number.

It is an amenable number.

6720151005721 is a deficient number, since it is larger than the sum of its proper divisors (91050231).

6720151005721 is an equidigital number, since it uses as much as digits as its factorization.

6720151005721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91050230.

The product of its (nonzero) digits is 29400, while the sum is 37.

Adding to 6720151005721 its reverse (1275001510276), we get a palindrome (7995152515997).

The spelling of 6720151005721 in words is "six trillion, seven hundred twenty billion, one hundred fifty-one million, five thousand, seven hundred twenty-one".