21226053529 has 2 divisors, whose sum is σ = 21226053530. Its totient is φ = 21226053528.

The previous prime is 21226053469. The next prime is 21226053553. The reversal of 21226053529 is 92535062212.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14089690000 + 7136363529 = 118700^2 + 84477^2 .

It is a cyclic number.

It is not a de Polignac number, because 21226053529 - 2¹⁷ = 21225922457 is a prime.

It is not a weakly prime, because it can be changed into another prime (21226053559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10613026764 + 10613026765.

It is an arithmetic number, because the mean of its divisors is an integer number (10613026765).

Almost surely, 2^21226053529 is an apocalyptic number.

It is an amenable number.

21226053529 is a deficient number, since it is larger than the sum of its proper divisors (1).

21226053529 is an equidigital number, since it uses as much as digits as its factorization.

21226053529 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 21226053529 in words is "twenty-one billion, two hundred twenty-six million, fifty-three thousand, five hundred twenty-nine".