213936973789181 has 2 divisors, whose sum is σ = 213936973789182. Its totient is φ = 213936973789180.

The previous prime is 213936973789163. The next prime is 213936973789207. The reversal of 213936973789181 is 181987379639312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141675243313081 + 72261730476100 = 11902741^2 + 8500690^2 .

It is a cyclic number.

It is not a de Polignac number, because 213936973789181 - 2⁴⁶ = 143568229611517 is a prime.

It is a super-2 number, since 2×213936973789181² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213936973789141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106968486894590 + 106968486894591.

It is an arithmetic number, because the mean of its divisors is an integer number (106968486894591).

Almost surely, 2^{213936973789181} is an apocalyptic number.

It is an amenable number.

213936973789181 is a deficient number, since it is larger than the sum of its proper divisors (1).

213936973789181 is an equidigital number, since it uses as much as digits as its factorization.

213936973789181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 740710656, while the sum is 77.

The spelling of 213936973789181 in words is "two hundred thirteen trillion, nine hundred thirty-six billion, nine hundred seventy-three million, seven hundred eighty-nine thousand, one hundred eighty-one".