10566721 has 8 divisors (see below), whose sum is σ = 11642688. Its totient is φ = 9510000.

The previous prime is 10566713. The next prime is 10566737. The reversal of 10566721 is 12766501.

10566721 = T₄₀₆ + T₄₀₇ + ... + T₅₀₆.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10566721 - 2³ = 10566713 is a prime.

It is a super-2 number, since 2×10566721² = 223311185383682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10566721.

It is not an unprimeable number, because it can be changed into a prime (10566221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3645 + ... + 5866.

It is an arithmetic number, because the mean of its divisors is an integer number (1455336).

Almost surely, 2^10566721 is an apocalyptic number.

10566721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10566721 is a deficient number, since it is larger than the sum of its proper divisors (1075967).

10566721 is a wasteful number, since it uses less digits than its factorization.

10566721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9623.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 10566721 is about 3250.6493197514. The cubic root of 10566721 is about 219.4387969040.

It can be divided in two parts, 1056 and 6721, that added together give a palindrome (7777).

The spelling of 10566721 in words is "ten million, five hundred sixty-six thousand, seven hundred twenty-one".