10109721 has 8 divisors (see below), whose sum is σ = 13515840. Its totient is φ = 6721712.

The previous prime is 10109717. The next prime is 10109753. The reversal of 10109721 is 12790101.

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 10109721 - 2² = 10109717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10109711) 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, 3165 + ... + 5498.

It is an arithmetic number, because the mean of its divisors is an integer number (1689480).

Almost surely, 2^10109721 is an apocalyptic number.

It is an amenable number.

10109721 is a deficient number, since it is larger than the sum of its proper divisors (3406119).

10109721 is an equidigital number, since it uses as much as digits as its factorization.

10109721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9055.

The product of its (nonzero) digits is 126, while the sum is 21.

The square root of 10109721 is about 3179.5787456831. The cubic root of 10109721 is about 216.2285603613.

Adding to 10109721 its reverse (12790101), we get a palindrome (22899822).

It can be divided in two parts, 1010 and 9721, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 10109721 in words is "ten million, one hundred nine thousand, seven hundred twenty-one".