21240233204213 has 2 divisors, whose sum is σ = 21240233204214. Its totient is φ = 21240233204212.

The previous prime is 21240233204189. The next prime is 21240233204219. The reversal of 21240233204213 is 31240233204212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20194804662769 + 1045428541444 = 4493863^2 + 1022462^2 .

It is a cyclic number.

It is not a de Polignac number, because 21240233204213 - 2²⁶ = 21240166095349 is a prime.

It is a super-2 number, since 2×21240233204213² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21240233204219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620116602106 + 10620116602107.

It is an arithmetic number, because the mean of its divisors is an integer number (10620116602107).

Almost surely, 2^{21240233204213} is an apocalyptic number.

It is an amenable number.

21240233204213 is a deficient number, since it is larger than the sum of its proper divisors (1).

21240233204213 is an equidigital number, since it uses as much as digits as its factorization.

21240233204213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 29.

Adding to 21240233204213 its reverse (31240233204212), we get a palindrome (52480466408425).

Subtracting 21240233204213 from its reverse (31240233204212), we obtain a palindrome (9999999999999).

The spelling of 21240233204213 in words is "twenty-one trillion, two hundred forty billion, two hundred thirty-three million, two hundred four thousand, two hundred thirteen".