16601321213 has 2 divisors, whose sum is σ = 16601321214. Its totient is φ = 16601321212.

The previous prime is 16601321201. The next prime is 16601321251. The reversal of 16601321213 is 31212310661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9863866489 + 6737454724 = 99317^2 + 82082^2 .

It is a cyclic number.

It is not a de Polignac number, because 16601321213 - 2⁴ = 16601321197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16601321263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8300660606 + 8300660607.

It is an arithmetic number, because the mean of its divisors is an integer number (8300660607).

Almost surely, 2^16601321213 is an apocalyptic number.

It is an amenable number.

16601321213 is a deficient number, since it is larger than the sum of its proper divisors (1).

16601321213 is an equidigital number, since it uses as much as digits as its factorization.

16601321213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 16601321213 its reverse (31212310661), we get a palindrome (47813631874).

The spelling of 16601321213 in words is "sixteen billion, six hundred one million, three hundred twenty-one thousand, two hundred thirteen".