211321213234081 has 2 divisors, whose sum is σ = 211321213234082. Its totient is φ = 211321213234080.

The previous prime is 211321213234009. The next prime is 211321213234097. The reversal of 211321213234081 is 180432312123112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137358048400225 + 73963164833856 = 11719985^2 + 8600184^2 .

It is a cyclic number.

It is not a de Polignac number, because 211321213234081 - 2⁹ = 211321213233569 is a prime.

It is a super-2 number, since 2×211321213234081² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211321213034081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105660606617040 + 105660606617041.

It is an arithmetic number, because the mean of its divisors is an integer number (105660606617041).

Almost surely, 2^{211321213234081} is an apocalyptic number.

It is an amenable number.

211321213234081 is a deficient number, since it is larger than the sum of its proper divisors (1).

211321213234081 is an equidigital number, since it uses as much as digits as its factorization.

211321213234081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 34.

Adding to 211321213234081 its reverse (180432312123112), we get a palindrome (391753525357193).

The spelling of 211321213234081 in words is "two hundred eleven trillion, three hundred twenty-one billion, two hundred thirteen million, two hundred thirty-four thousand, eighty-one".