21233003565 has 16 divisors (see below), whose sum is σ = 33978708288. Its totient is φ = 11322301056.

The previous prime is 21233003537. The next prime is 21233003579. The reversal of 21233003565 is 56530033212.

It is not a de Polignac number, because 21233003565 - 2⁶ = 21233003501 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31567 + ... + 208476.

It is an arithmetic number, because the mean of its divisors is an integer number (2123669268).

Almost surely, 2^21233003565 is an apocalyptic number.

It is an amenable number.

21233003565 is a deficient number, since it is larger than the sum of its proper divisors (12745704723).

21233003565 is a wasteful number, since it uses less digits than its factorization.

21233003565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245948.

The product of its (nonzero) digits is 16200, while the sum is 30.

Adding to 21233003565 its reverse (56530033212), we get a palindrome (77763036777).

The spelling of 21233003565 in words is "twenty-one billion, two hundred thirty-three million, three thousand, five hundred sixty-five".