13664121 has 4 divisors (see below), whose sum is σ = 18218832. Its totient is φ = 9109412.

The previous prime is 13664071. The next prime is 13664129. The reversal of 13664121 is 12146631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13664121 - 2⁹ = 13663609 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13664091 and 13664100.

It is not an unprimeable number, because it can be changed into a prime (13664129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2277351 + ... + 2277356.

It is an arithmetic number, because the mean of its divisors is an integer number (4554708).

Almost surely, 2^13664121 is an apocalyptic number.

It is an amenable number.

13664121 is a deficient number, since it is larger than the sum of its proper divisors (4554711).

13664121 is an equidigital number, since it uses as much as digits as its factorization.

13664121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4554710.

The product of its digits is 864, while the sum is 24.

The square root of 13664121 is about 3696.5011835518. The cubic root of 13664121 is about 239.0711843656.

The spelling of 13664121 in words is "thirteen million, six hundred sixty-four thousand, one hundred twenty-one".