21321121320211 has 2 divisors, whose sum is σ = 21321121320212. Its totient is φ = 21321121320210.

The previous prime is 21321121320197. The next prime is 21321121320221. The reversal of 21321121320211 is 11202312112312.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21321121320211 - 2¹¹ = 21321121318163 is a prime.

It is a super-3 number, since 3×21321121320211³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21321121320221) 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, 10660560660105 + 10660560660106.

It is an arithmetic number, because the mean of its divisors is an integer number (10660560660106).

Almost surely, 2^{21321121320211} is an apocalyptic number.

21321121320211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321121320211 is an equidigital number, since it uses as much as digits as its factorization.

21321121320211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21321121320211 its reverse (11202312112312), we get a palindrome (32523433432523).

The spelling of 21321121320211 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred twenty-one million, three hundred twenty thousand, two hundred eleven".