7299822721 has 3 divisors (see below), whose sum is σ = 7299908161. Its totient is φ = 7299737282.

The previous prime is 7299822653. The next prime is 7299822727. The reversal of 7299822721 is 1272289927.

The square root of 7299822721 is 85439.

It is a perfect power (a square), and thus also a powerful number.

7299822721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1272289927 = 97 ⋅13116391.

It is not a de Polignac number, because 7299822721 - 2²¹ = 7297725569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7299822727) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 42720 + ... + 128158.

Almost surely, 2^7299822721 is an apocalyptic number.

7299822721 is the 85439-th square number.

7299822721 is the 42720-th centered octagonal number.

It is an amenable number.

7299822721 is a deficient number, since it is larger than the sum of its proper divisors (85440).

7299822721 is an frugal number, since it uses more digits than its factorization.

7299822721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170878 (or 85439 counting only the distinct ones).

The product of its digits is 508032, while the sum is 49.

The cubic root of 7299822721 is about 1939.8617112784.

Multiplying 7299822721 by its sum of digits (49), we get a square (357691313329 = 598073²).

The spelling of 7299822721 in words is "seven billion, two hundred ninety-nine million, eight hundred twenty-two thousand, seven hundred twenty-one".