10521985 has 4 divisors (see below), whose sum is σ = 12626388. Its totient is φ = 8417584.

The previous prime is 10521947. The next prime is 10522007. The reversal of 10521985 is 58912501.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4626801 + 5895184 = 2151^2 + 2428^2 .

It is a cyclic number.

It is not a de Polignac number, because 10521985 - 2¹⁹ = 9997697 is a prime.

It is a super-2 number, since 2×10521985² = 221424336680450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1052194 + ... + 1052203.

It is an arithmetic number, because the mean of its divisors is an integer number (3156597).

Almost surely, 2^10521985 is an apocalyptic number.

It is an amenable number.

10521985 is a deficient number, since it is larger than the sum of its proper divisors (2104403).

10521985 is an equidigital number, since it uses as much as digits as its factorization.

10521985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2104402.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 10521985 is about 3243.7609344710. The cubic root of 10521985 is about 219.1286817665.

The spelling of 10521985 in words is "ten million, five hundred twenty-one thousand, nine hundred eighty-five".