13821099 has 4 divisors (see below), whose sum is σ = 18428136. Its totient is φ = 9214064.

The previous prime is 13821079. The next prime is 13821121. The reversal of 13821099 is 99012831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13821099 - 2⁸ = 13820843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13821019) 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 3 ways as a sum of consecutive naturals, for example, 2303514 + ... + 2303519.

It is an arithmetic number, because the mean of its divisors is an integer number (4607034).

Almost surely, 2^13821099 is an apocalyptic number.

13821099 is a deficient number, since it is larger than the sum of its proper divisors (4607037).

13821099 is an equidigital number, since it uses as much as digits as its factorization.

13821099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4607036.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 13821099 is about 3717.6738695050. The cubic root of 13821099 is about 239.9832106311.

The spelling of 13821099 in words is "thirteen million, eight hundred twenty-one thousand, ninety-nine".