21311234032213 has 2 divisors, whose sum is σ = 21311234032214. Its totient is φ = 21311234032212.

The previous prime is 21311234032171. The next prime is 21311234032271. The reversal of 21311234032213 is 31223043211312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20618074548369 + 693159483844 = 4540713^2 + 832562^2 .

It is a cyclic number.

It is not a de Polignac number, because 21311234032213 - 2¹⁷ = 21311233901141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21311234032273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655617016106 + 10655617016107.

It is an arithmetic number, because the mean of its divisors is an integer number (10655617016107).

Almost surely, 2^{21311234032213} is an apocalyptic number.

It is an amenable number.

21311234032213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21311234032213 is an equidigital number, since it uses as much as digits as its factorization.

21311234032213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

Adding to 21311234032213 its reverse (31223043211312), we get a palindrome (52534277243525).

The spelling of 21311234032213 in words is "twenty-one trillion, three hundred eleven billion, two hundred thirty-four million, thirty-two thousand, two hundred thirteen".