10985721 has 4 divisors (see below), whose sum is σ = 14647632. Its totient is φ = 7323812.

The previous prime is 10985719. The next prime is 10985729. The reversal of 10985721 is 12758901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10985721 - 2¹ = 10985719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10985729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1830951 + ... + 1830956.

It is an arithmetic number, because the mean of its divisors is an integer number (3661908).

Almost surely, 2^10985721 is an apocalyptic number.

It is an amenable number.

10985721 is a deficient number, since it is larger than the sum of its proper divisors (3661911).

10985721 is an equidigital number, since it uses as much as digits as its factorization.

10985721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3661910.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 10985721 is about 3314.4714510763. The cubic root of 10985721 is about 222.3017364435.

The spelling of 10985721 in words is "ten million, nine hundred eighty-five thousand, seven hundred twenty-one".