11817021 has 8 divisors (see below), whose sum is σ = 15972160. Its totient is φ = 7769952.

The previous prime is 11817019. The next prime is 11817053. The reversal of 11817021 is 12071811.

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

It is not a de Polignac number, because 11817021 - 2¹ = 11817019 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 (11817121) 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, 26761 + ... + 27198.

It is an arithmetic number, because the mean of its divisors is an integer number (1996520).

Almost surely, 2^11817021 is an apocalyptic number.

It is an amenable number.

11817021 is a deficient number, since it is larger than the sum of its proper divisors (4155139).

11817021 is an equidigital number, since it uses as much as digits as its factorization.

11817021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54035.

The product of its (nonzero) digits is 112, while the sum is 21.

The square root of 11817021 is about 3437.5894170189. The cubic root of 11817021 is about 227.7732240392.

Adding to 11817021 its reverse (12071811), we get a palindrome (23888832).

The spelling of 11817021 in words is "eleven million, eight hundred seventeen thousand, twenty-one".