216324721242613 has 16 divisors (see below), whose sum is σ = 224952398624880. Its totient is φ = 207775007870976.

The previous prime is 216324721242611. The next prime is 216324721242661. The reversal of 216324721242613 is 316242127423612.

It can be written as a sum of positive squares in 8 ways, for example, as 19438866556209 + 196885854686404 = 4408953^2 + 14031602^2 .

It is a cyclic number.

It is not a de Polignac number, because 216324721242613 - 2¹ = 216324721242611 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 (216324721242611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146561931 + ... + 148030567.

It is an arithmetic number, because the mean of its divisors is an integer number (14059524914055).

Almost surely, 2^{216324721242613} is an apocalyptic number.

It is an amenable number.

216324721242613 is a deficient number, since it is larger than the sum of its proper divisors (8627677382267).

216324721242613 is a wasteful number, since it uses less digits than its factorization.

216324721242613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1495176.

The product of its digits is 1161216, while the sum is 46.

The spelling of 216324721242613 in words is "two hundred sixteen trillion, three hundred twenty-four billion, seven hundred twenty-one million, two hundred forty-two thousand, six hundred thirteen".