11816021 has 8 divisors (see below), whose sum is σ = 13969920. Its totient is φ = 9778608.

The previous prime is 11816017. The next prime is 11816027. The reversal of 11816021 is 12061811.

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

It is not a de Polignac number, because 11816021 - 2² = 11816017 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11815984 and 11816002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11816027) 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, 28901 + ... + 29306.

It is an arithmetic number, because the mean of its divisors is an integer number (1746240).

Almost surely, 2^11816021 is an apocalyptic number.

It is an amenable number.

11816021 is a deficient number, since it is larger than the sum of its proper divisors (2153899).

11816021 is an equidigital number, since it uses as much as digits as its factorization.

11816021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58243.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 11816021 is about 3437.4439631796. The cubic root of 11816021 is about 227.7667988539.

Adding to 11816021 its reverse (12061811), we get a palindrome (23877832).

The spelling of 11816021 in words is "eleven million, eight hundred sixteen thousand, twenty-one".