21226530026413 has 2 divisors, whose sum is σ = 21226530026414. Its totient is φ = 21226530026412.

The previous prime is 21226530026407. The next prime is 21226530026447. The reversal of 21226530026413 is 31462003562212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14742850688164 + 6483679338249 = 3839642^2 + 2546307^2 .

It is a cyclic number.

It is not a de Polignac number, because 21226530026413 - 2¹⁷ = 21226529895341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21226534026413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10613265013206 + 10613265013207.

It is an arithmetic number, because the mean of its divisors is an integer number (10613265013207).

Almost surely, 2^{21226530026413} is an apocalyptic number.

It is an amenable number.

21226530026413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21226530026413 is an equidigital number, since it uses as much as digits as its factorization.

21226530026413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 37.

Adding to 21226530026413 its reverse (31462003562212), we get a palindrome (52688533588625).

The spelling of 21226530026413 in words is "twenty-one trillion, two hundred twenty-six billion, five hundred thirty million, twenty-six thousand, four hundred thirteen".