11315821 has 8 divisors (see below), whose sum is σ = 12678624. Its totient is φ = 10008720.

The previous prime is 11315813. The next prime is 11315867. The reversal of 11315821 is 12851311.

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 11315821 - 2³ = 11315813 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11315792 and 11315801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11315891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13495 + ... + 14308.

It is an arithmetic number, because the mean of its divisors is an integer number (1584828).

Almost surely, 2^11315821 is an apocalyptic number.

11315821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11315821 is a deficient number, since it is larger than the sum of its proper divisors (1362803).

11315821 is a wasteful number, since it uses less digits than its factorization.

11315821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27851.

The product of its digits is 240, while the sum is 22.

The square root of 11315821 is about 3363.8996715122. The cubic root of 11315821 is about 224.5063812354.

The spelling of 11315821 in words is "eleven million, three hundred fifteen thousand, eight hundred twenty-one".