21535003500449 has 2 divisors, whose sum is σ = 21535003500450. Its totient is φ = 21535003500448.

The previous prime is 21535003500407. The next prime is 21535003500509. The reversal of 21535003500449 is 94400530053512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21306237393424 + 228766107025 = 4615868^2 + 478295^2 .

It is a cyclic number.

It is not a de Polignac number, because 21535003500449 - 2¹⁶ = 21535003434913 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21535003560449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10767501750224 + 10767501750225.

It is an arithmetic number, because the mean of its divisors is an integer number (10767501750225).

Almost surely, 2^{21535003500449} is an apocalyptic number.

It is an amenable number.

21535003500449 is a deficient number, since it is larger than the sum of its proper divisors (1).

21535003500449 is an equidigital number, since it uses as much as digits as its factorization.

21535003500449 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 21535003500449 in words is "twenty-one trillion, five hundred thirty-five billion, three million, five hundred thousand, four hundred forty-nine".