10315721 has 4 divisors (see below), whose sum is σ = 11109252. Its totient is φ = 9522192.

The previous prime is 10315699. The next prime is 10315729. The reversal of 10315721 is 12751301.

10315721 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.

It can be written as a sum of positive squares in 2 ways, for example, as 3367225 + 6948496 = 1835^2 + 2636^2 .

It is a cyclic number.

It is not a de Polignac number, because 10315721 - 2¹⁰ = 10314697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10315693 and 10315702.

It is not an unprimeable number, because it can be changed into a prime (10315729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396746 + ... + 396771.

It is an arithmetic number, because the mean of its divisors is an integer number (2777313).

Almost surely, 2^10315721 is an apocalyptic number.

It is an amenable number.

10315721 is a deficient number, since it is larger than the sum of its proper divisors (793531).

10315721 is an equidigital number, since it uses as much as digits as its factorization.

10315721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 793530.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 10315721 is about 3211.8096145320. The cubic root of 10315721 is about 217.6873516731.

The spelling of 10315721 in words is "ten million, three hundred fifteen thousand, seven hundred twenty-one".