213488889564989 has 2 divisors, whose sum is σ = 213488889564990. Its totient is φ = 213488889564988.

The previous prime is 213488889564983. The next prime is 213488889565033. The reversal of 213488889564989 is 989465988884312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172284263004100 + 41204626560889 = 13125710^2 + 6419083^2 .

It is a cyclic number.

It is not a de Polignac number, because 213488889564989 - 2⁴⁰ = 212389377937213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213488889564898 and 213488889564907.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213488889564983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106744444782494 + 106744444782495.

It is an arithmetic number, because the mean of its divisors is an integer number (106744444782495).

Almost surely, 2^{213488889564989} is an apocalyptic number.

It is an amenable number.

213488889564989 is a deficient number, since it is larger than the sum of its proper divisors (1).

213488889564989 is an equidigital number, since it uses as much as digits as its factorization.

213488889564989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68797071360, while the sum is 92.

Adding to 213488889564989 its sum of digits (92), we get a square (213488889565081 = 14611259²).

The spelling of 213488889564989 in words is "two hundred thirteen trillion, four hundred eighty-eight billion, eight hundred eighty-nine million, five hundred sixty-four thousand, nine hundred eighty-nine".