10721985 has 32 divisors (see below), whose sum is σ = 19128960. Its totient is φ = 5096448.

The previous prime is 10721981. The next prime is 10721999. The reversal of 10721985 is 58912701.

10721985 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 10721985 - 2² = 10721981 is a prime.

It is a super-2 number, since 2×10721985² = 229921924680450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10721981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3739 + ... + 5951.

It is an arithmetic number, because the mean of its divisors is an integer number (597780).

Almost surely, 2^10721985 is an apocalyptic number.

10721985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10721985 is a deficient number, since it is larger than the sum of its proper divisors (8406975).

10721985 is a wasteful number, since it uses less digits than its factorization.

10721985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2257.

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

The square root of 10721985 is about 3274.4442276515. Note that the first 3 decimals coincide. The cubic root of 10721985 is about 220.5083629677.

The spelling of 10721985 in words is "ten million, seven hundred twenty-one thousand, nine hundred eighty-five".