21226106009 has 2 divisors, whose sum is σ = 21226106010. Its totient is φ = 21226106008.

The previous prime is 21226106003. The next prime is 21226106029. The reversal of 21226106009 is 90060162212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13277491984 + 7948614025 = 115228^2 + 89155^2 .

It is a cyclic number.

It is not a de Polignac number, because 21226106009 - 2⁴ = 21226105993 is a prime.

It is not a weakly prime, because it can be changed into another prime (21226106003) 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, 10613053004 + 10613053005.

It is an arithmetic number, because the mean of its divisors is an integer number (10613053005).

Almost surely, 2^21226106009 is an apocalyptic number.

It is an amenable number.

21226106009 is a deficient number, since it is larger than the sum of its proper divisors (1).

21226106009 is an equidigital number, since it uses as much as digits as its factorization.

21226106009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The spelling of 21226106009 in words is "twenty-one billion, two hundred twenty-six million, one hundred six thousand, nine".