10685021 has 6 divisors (see below), whose sum is σ = 11071710. Its totient is φ = 10299576.

The previous prime is 10684997. The next prime is 10685023. The reversal of 10685021 is 12058601.

It can be written as a sum of positive squares in only one way, i.e., 9211225 + 1473796 = 3035^2 + 1214^2 .

It is not a de Polignac number, because 10685021 - 2¹⁰ = 10683997 is a prime.

It is a super-2 number, since 2×10685021² = 228339347540882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10685023) 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 5 ways as a sum of consecutive naturals, for example, 17300 + ... + 17906.

It is an arithmetic number, because the mean of its divisors is an integer number (1845285).

Almost surely, 2^10685021 is an apocalyptic number.

It is an amenable number.

10685021 is a deficient number, since it is larger than the sum of its proper divisors (386689).

10685021 is an frugal number, since it uses more digits than its factorization.

10685021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243 (or 636 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 10685021 is about 3268.7950379306. The cubic root of 10685021 is about 220.2546706458.

The spelling of 10685021 in words is "ten million, six hundred eighty-five thousand, twenty-one".