211304323121 has 2 divisors, whose sum is σ = 211304323122. Its totient is φ = 211304323120.

The previous prime is 211304323073. The next prime is 211304323129. The reversal of 211304323121 is 121323403112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192116532721 + 19187790400 = 438311^2 + 138520^2 .

It is a cyclic number.

It is not a de Polignac number, because 211304323121 - 2²² = 211300128817 is a prime.

It is not a weakly prime, because it can be changed into another prime (211304323129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105652161560 + 105652161561.

It is an arithmetic number, because the mean of its divisors is an integer number (105652161561).

Almost surely, 2^211304323121 is an apocalyptic number.

It is an amenable number.

211304323121 is a deficient number, since it is larger than the sum of its proper divisors (1).

211304323121 is an equidigital number, since it uses as much as digits as its factorization.

211304323121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 211304323121 its reverse (121323403112), we get a palindrome (332627726233).

The spelling of 211304323121 in words is "two hundred eleven billion, three hundred four million, three hundred twenty-three thousand, one hundred twenty-one".