11198821 has 2 divisors, whose sum is σ = 11198822. Its totient is φ = 11198820.

The previous prime is 11198819. The next prime is 11198839. The reversal of 11198821 is 12889111.

11198821 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10982596 + 216225 = 3314^2 + 465^2 .

It is a cyclic number.

It is not a de Polignac number, because 11198821 - 2¹ = 11198819 is a prime.

Together with 11198819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11198851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5599410 + 5599411.

It is an arithmetic number, because the mean of its divisors is an integer number (5599411).

Almost surely, 2^11198821 is an apocalyptic number.

It is an amenable number.

11198821 is a deficient number, since it is larger than the sum of its proper divisors (1).

11198821 is an equidigital number, since it uses as much as digits as its factorization.

11198821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 31.

The square root of 11198821 is about 3346.4639546841. The cubic root of 11198821 is about 223.7299373416.

The spelling of 11198821 in words is "eleven million, one hundred ninety-eight thousand, eight hundred twenty-one".