10521665 has 16 divisors (see below), whose sum is σ = 15742080. Its totient is φ = 6558720.

The previous prime is 10521659. The next prime is 10521671. The reversal of 10521665 is 56612501.

It is an interprime number because it is at equal distance from previous prime (10521659) and next prime (10521671).

It is not a de Polignac number, because 10521665 - 2¹⁴ = 10505281 is a prime.

It is a super-2 number, since 2×10521665² = 221410868744450, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13280 + ... + 14049.

It is an arithmetic number, because the mean of its divisors is an integer number (983880).

Almost surely, 2^10521665 is an apocalyptic number.

It is an amenable number.

10521665 is a deficient number, since it is larger than the sum of its proper divisors (5220415).

10521665 is a wasteful number, since it uses less digits than its factorization.

10521665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27352.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 10521665 is about 3243.7116086360. The cubic root of 10521665 is about 219.1264603260.

The spelling of 10521665 in words is "ten million, five hundred twenty-one thousand, six hundred sixty-five".