10261721 has 2 divisors, whose sum is σ = 10261722. Its totient is φ = 10261720.

The previous prime is 10261717. The next prime is 10261723. The reversal of 10261721 is 12716201.

10261721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8202496 + 2059225 = 2864^2 + 1435^2 .

It is a cyclic number.

It is not a de Polignac number, because 10261721 - 2² = 10261717 is a prime.

Together with 10261723, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 10261693 and 10261702.

It is not a weakly prime, because it can be changed into another prime (10261723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5130860 + 5130861.

It is an arithmetic number, because the mean of its divisors is an integer number (5130861).

Almost surely, 2^10261721 is an apocalyptic number.

It is an amenable number.

10261721 is a deficient number, since it is larger than the sum of its proper divisors (1).

10261721 is an equidigital number, since it uses as much as digits as its factorization.

10261721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 10261721 is about 3203.3921083751. The cubic root of 10261721 is about 217.3068422071.

Adding to 10261721 its reverse (12716201), we get a palindrome (22977922).

The spelling of 10261721 in words is "ten million, two hundred sixty-one thousand, seven hundred twenty-one".