10211721 has 16 divisors (see below), whose sum is σ = 15435840. Its totient is φ = 5952960.

The previous prime is 10211711. The next prime is 10211723. The reversal of 10211721 is 12711201.

10211721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 10211721 - 2⁶ = 10211657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10211721.

It is not an unprimeable number, because it can be changed into a prime (10211723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6150 + ... + 7631.

It is an arithmetic number, because the mean of its divisors is an integer number (964740).

Almost surely, 2^10211721 is an apocalyptic number.

It is an amenable number.

10211721 is a deficient number, since it is larger than the sum of its proper divisors (5224119).

10211721 is a wasteful number, since it uses less digits than its factorization.

10211721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13816.

The product of its (nonzero) digits is 28, while the sum is 15.

The square root of 10211721 is about 3195.5783514100. The cubic root of 10211721 is about 216.9533265515.

Adding to 10211721 its reverse (12711201), we get a palindrome (22922922).

The spelling of 10211721 in words is "ten million, two hundred eleven thousand, seven hundred twenty-one".