211211002012181 has 2 divisors, whose sum is σ = 211211002012182. Its totient is φ = 211211002012180.

The previous prime is 211211002012177. The next prime is 211211002012223. The reversal of 211211002012181 is 181210200112112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208630320409681 + 2580681602500 = 14444041^2 + 1606450^2 .

It is a cyclic number.

It is not a de Polignac number, because 211211002012181 - 2² = 211211002012177 is a prime.

It is a super-2 number, since 2×211211002012181² (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 (211211002012121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105605501006090 + 105605501006091.

It is an arithmetic number, because the mean of its divisors is an integer number (105605501006091).

Almost surely, 2^{211211002012181} is an apocalyptic number.

It is an amenable number.

211211002012181 is a deficient number, since it is larger than the sum of its proper divisors (1).

211211002012181 is an equidigital number, since it uses as much as digits as its factorization.

211211002012181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 23.

Adding to 211211002012181 its reverse (181210200112112), we get a palindrome (392421202124293).

The spelling of 211211002012181 in words is "two hundred eleven trillion, two hundred eleven billion, two million, twelve thousand, one hundred eighty-one".