53300721 has 8 divisors (see below), whose sum is σ = 71104384. Its totient is φ = 35515440.

The previous prime is 53300713. The next prime is 53300743. The reversal of 53300721 is 12700335.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 53300721 - 2³ = 53300713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53300701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5091 + ... + 11511.

It is an arithmetic number, because the mean of its divisors is an integer number (8888048).

Almost surely, 2^53300721 is an apocalyptic number.

It is an amenable number.

53300721 is a deficient number, since it is larger than the sum of its proper divisors (17803663).

53300721 is a wasteful number, since it uses less digits than its factorization.

53300721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9191.

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 53300721 is about 7300.7342781394. The cubic root of 53300721 is about 376.3376724571.

It can be divided in two parts, 533007 and 21, that added together give a triangular number (533028 = T₁₀₃₂).

The spelling of 53300721 in words is "fifty-three million, three hundred thousand, seven hundred twenty-one".