11803021 has 2 divisors, whose sum is σ = 11803022. Its totient is φ = 11803020.

The previous prime is 11803019. The next prime is 11803031. The reversal of 11803021 is 12030811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11634921 + 168100 = 3411^2 + 410^2 .

It is a cyclic number.

It is not a de Polignac number, because 11803021 - 2¹ = 11803019 is a prime.

It is a super-2 number, since 2×11803021² = 278622609452882, which contains 22 as substring.

Together with 11803019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 11802986 and 11803004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11803031) 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 as a sum of consecutive naturals, namely, 5901510 + 5901511.

It is an arithmetic number, because the mean of its divisors is an integer number (5901511).

Almost surely, 2^11803021 is an apocalyptic number.

It is an amenable number.

11803021 is a deficient number, since it is larger than the sum of its proper divisors (1).

11803021 is an equidigital number, since it uses as much as digits as its factorization.

11803021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 11803021 is about 3435.5525028734. The cubic root of 11803021 is about 227.6832384366.

Adding to 11803021 its reverse (12030811), we get a palindrome (23833832).

The spelling of 11803021 in words is "eleven million, eight hundred three thousand, twenty-one".