7721321651360 has 48 divisors (see below), whose sum is σ = 18241788589416. Its totient is φ = 3088500523008.

The previous prime is 7721321651359. The next prime is 7721321651363. The reversal of 7721321651360 is 631561231277.

It can be written as a sum of positive squares in 4 ways, for example, as 4414553975056 + 3306767676304 = 2101084^2 + 1818452^2 .

It is not an unprimeable number, because it can be changed into a prime (7721321651363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33770384 + ... + 33998256.

Almost surely, 2^{7721321651360} is an apocalyptic number.

It is an amenable number.

7721321651360 is an abundant number, since it is smaller than the sum of its proper divisors (10520466938056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7721321651360 is a wasteful number, since it uses less digits than its factorization.

7721321651360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439665 (or 439657 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 44.

The spelling of 7721321651360 in words is "seven trillion, seven hundred twenty-one billion, three hundred twenty-one million, six hundred fifty-one thousand, three hundred sixty".