21226205411 has 2 divisors, whose sum is σ = 21226205412. Its totient is φ = 21226205410.

The previous prime is 21226205359. The next prime is 21226205461. The reversal of 21226205411 is 11450262212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21226205411 - 2¹⁸ = 21225943267 is a prime.

It is a super-2 number, since 2×21226205411² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21226205461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10613102705 + 10613102706.

It is an arithmetic number, because the mean of its divisors is an integer number (10613102706).

Almost surely, 2^21226205411 is an apocalyptic number.

21226205411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21226205411 is an equidigital number, since it uses as much as digits as its factorization.

21226205411 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 21226205411 its reverse (11450262212), we get a palindrome (32676467623).

The spelling of 21226205411 in words is "twenty-one billion, two hundred twenty-six million, two hundred five thousand, four hundred eleven".