10817621 has 4 divisors (see below), whose sum is σ = 10831500. Its totient is φ = 10803744.

The previous prime is 10817561. The next prime is 10817623. The reversal of 10817621 is 12671801.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12671801 = 193 ⋅65657.

It can be written as a sum of positive squares in 2 ways, for example, as 6195121 + 4622500 = 2489^2 + 2150^2 .

It is a cyclic number.

It is not a de Polignac number, because 10817621 - 2¹⁸ = 10555477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10817623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5696 + ... + 7353.

It is an arithmetic number, because the mean of its divisors is an integer number (2707875).

Almost surely, 2^10817621 is an apocalyptic number.

It is an amenable number.

10817621 is a deficient number, since it is larger than the sum of its proper divisors (13879).

10817621 is an equidigital number, since it uses as much as digits as its factorization.

10817621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13878.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 10817621 is about 3289.0152021540. The cubic root of 10817621 is about 221.1620400031.

The spelling of 10817621 in words is "ten million, eight hundred seventeen thousand, six hundred twenty-one".