10660921 has 12 divisors (see below), whose sum is σ = 11642668. Its totient is φ = 9752832.

The previous prime is 10660907. The next prime is 10660927. The reversal of 10660921 is 12906601.

10660921 = 29² + 30² + ... + 317².

It can be written as a sum of positive squares in 6 ways, for example, as 4682896 + 5978025 = 2164^2 + 2445^2 .

It is not a de Polignac number, because 10660921 - 2⁵ = 10660889 is a prime.

It is a super-2 number, since 2×10660921² = 227310473136482, 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 (10660927) 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 11 ways as a sum of consecutive naturals, for example, 10195 + ... + 11191.

Almost surely, 2^10660921 is an apocalyptic number.

It is an amenable number.

10660921 is a deficient number, since it is larger than the sum of its proper divisors (981747).

10660921 is an equidigital number, since it uses as much as digits as its factorization.

10660921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068 (or 1051 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 10660921 is about 3265.1065832527. The cubic root of 10660921 is about 220.0889516330.

The spelling of 10660921 in words is "ten million, six hundred sixty thousand, nine hundred twenty-one".