321566645214013 has 4 divisors (see below), whose sum is σ = 340482330226620. Its totient is φ = 302650960201408.

The previous prime is 321566645214011. The next prime is 321566645214097. The reversal of 321566645214013 is 310412546665123.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 257364918504409 + 64201726709604 = 16042597^2 + 8012598^2 .

It is a cyclic number.

It is not a de Polignac number, because 321566645214013 - 2¹ = 321566645214011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321566645214011) 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, 9457842506278 + ... + 9457842506311.

It is an arithmetic number, because the mean of its divisors is an integer number (85120582556655).

Almost surely, 2^{321566645214013} is an apocalyptic number.

It is an amenable number.

321566645214013 is a deficient number, since it is larger than the sum of its proper divisors (18915685012607).

321566645214013 is a wasteful number, since it uses less digits than its factorization.

321566645214013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18915685012606.

The product of its (nonzero) digits is 3110400, while the sum is 49.

The spelling of 321566645214013 in words is "three hundred twenty-one trillion, five hundred sixty-six billion, six hundred forty-five million, two hundred fourteen thousand, thirteen".