10206721 has 8 divisors (see below), whose sum is σ = 11813120. Its totient is φ = 8637408.

The previous prime is 10206697. The next prime is 10206731. The reversal of 10206721 is 12760201.

10206721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 10206721 - 2⁵ = 10206689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10206731) 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, 8676 + ... + 9781.

It is an arithmetic number, because the mean of its divisors is an integer number (1476640).

Almost surely, 2^10206721 is an apocalyptic number.

It is an amenable number.

10206721 is a deficient number, since it is larger than the sum of its proper divisors (1606399).

10206721 is an equidigital number, since it uses as much as digits as its factorization.

10206721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18543.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 10206721 is about 3194.7959246249. The cubic root of 10206721 is about 216.9179115702.

Adding to 10206721 its reverse (12760201), we get a palindrome (22966922).

The spelling of 10206721 in words is "ten million, two hundred six thousand, seven hundred twenty-one".