10023721 has 4 divisors (see below), whose sum is σ = 10268244. Its totient is φ = 9779200.

The previous prime is 10023701. The next prime is 10023743. The reversal of 10023721 is 12732001.

It is a happy number.

10023721 is digitally balanced in base 2, 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 189225 + 9834496 = 435^2 + 3136^2 .

It is a cyclic number.

It is not a de Polignac number, because 10023721 - 2⁷ = 10023593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10023695 and 10023704.

It is not an unprimeable number, because it can be changed into a prime (10023701) 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, 122200 + ... + 122281.

It is an arithmetic number, because the mean of its divisors is an integer number (2567061).

Almost surely, 2^10023721 is an apocalyptic number.

It is an amenable number.

10023721 is a deficient number, since it is larger than the sum of its proper divisors (244523).

10023721 is an equidigital number, since it uses as much as digits as its factorization.

10023721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244522.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 10023721 is about 3166.0260580103. The cubic root of 10023721 is about 215.6136856347.

Adding to 10023721 its reverse (12732001), we get a palindrome (22755722).

The spelling of 10023721 in words is "ten million, twenty-three thousand, seven hundred twenty-one".