1321218805 has 8 divisors (see below), whose sum is σ = 1585814400. Its totient is φ = 1056740496.

The previous prime is 1321218803. The next prime is 1321218883. The reversal of 1321218805 is 5088121231.

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 1321218805 - 2¹ = 1321218803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321218803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2265 + ... + 51454.

It is an arithmetic number, because the mean of its divisors is an integer number (198226800).

Almost surely, 2^1321218805 is an apocalyptic number.

It is an amenable number.

1321218805 is a deficient number, since it is larger than the sum of its proper divisors (264595595).

1321218805 is an equidigital number, since it uses as much as digits as its factorization.

1321218805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58643.

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 1321218805 is about 36348.5736308868. The cubic root of 1321218805 is about 1097.2988283264.

The spelling of 1321218805 in words is "one billion, three hundred twenty-one million, two hundred eighteen thousand, eight hundred five".