10491821 has 8 divisors (see below), whose sum is σ = 10642944. Its totient is φ = 10342080.

The previous prime is 10491809. The next prime is 10491847. The reversal of 10491821 is 12819401.

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 10491821 - 2¹⁸ = 10229677 is a prime.

It is a super-2 number, since 2×10491821² = 220156615792082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10491421) 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 7 ways as a sum of consecutive naturals, for example, 30965 + ... + 31301.

It is an arithmetic number, because the mean of its divisors is an integer number (1330368).

Almost surely, 2^10491821 is an apocalyptic number.

It is an amenable number.

10491821 is a deficient number, since it is larger than the sum of its proper divisors (151123).

10491821 is a wasteful number, since it uses less digits than its factorization.

10491821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 10491821 is about 3239.1080562402. The cubic root of 10491821 is about 218.9190849439.

The spelling of 10491821 in words is "ten million, four hundred ninety-one thousand, eight hundred twenty-one".