10201721 has 4 divisors (see below), whose sum is σ = 10246500. Its totient is φ = 10156944.

The previous prime is 10201699. The next prime is 10201769. The reversal of 10201721 is 12710201.

10201721 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 5707321 + 4494400 = 2389^2 + 2120^2 .

It is a cyclic number.

It is not a de Polignac number, because 10201721 - 2¹⁴ = 10185337 is a prime.

It is a super-2 number, since 2×10201721² = 208150222723682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10201696 and 10201705.

It is not an unprimeable number, because it can be changed into a prime (10201421) 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, 22046 + ... + 22503.

It is an arithmetic number, because the mean of its divisors is an integer number (2561625).

Almost surely, 2^10201721 is an apocalyptic number.

It is an amenable number.

10201721 is a deficient number, since it is larger than the sum of its proper divisors (44779).

10201721 is an equidigital number, since it uses as much as digits as its factorization.

10201721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44778.

The product of its (nonzero) digits is 28, while the sum is 14.

The square root of 10201721 is about 3194.0133061714. The cubic root of 10201721 is about 216.8824850210.

Adding to 10201721 its reverse (12710201), we get a palindrome (22911922).

The spelling of 10201721 in words is "ten million, two hundred one thousand, seven hundred twenty-one".