210312120181 has 2 divisors, whose sum is σ = 210312120182. Its totient is φ = 210312120180.

The previous prime is 210312120157. The next prime is 210312120191. The reversal of 210312120181 is 181021213012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 126810771025 + 83501349156 = 356105^2 + 288966^2 .

It is a cyclic number.

It is not a de Polignac number, because 210312120181 - 2⁵ = 210312120149 is a prime.

It is a super-2 number, since 2×210312120181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210312120191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105156060090 + 105156060091.

It is an arithmetic number, because the mean of its divisors is an integer number (105156060091).

Almost surely, 2^210312120181 is an apocalyptic number.

It is an amenable number.

210312120181 is a deficient number, since it is larger than the sum of its proper divisors (1).

210312120181 is an equidigital number, since it uses as much as digits as its factorization.

210312120181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 22.

Adding to 210312120181 its reverse (181021213012), we get a palindrome (391333333193).

The spelling of 210312120181 in words is "two hundred ten billion, three hundred twelve million, one hundred twenty thousand, one hundred eighty-one".