21668535335 has 16 divisors (see below), whose sum is σ = 26129204640. Its totient is φ = 17250293760.

The previous prime is 21668535331. The next prime is 21668535337. The reversal of 21668535335 is 53353586612.

It is not a de Polignac number, because 21668535335 - 2² = 21668535331 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21668535335.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21668535331) 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 in 15 ways as a sum of consecutive naturals, for example, 1865576 + ... + 1877154.

It is an arithmetic number, because the mean of its divisors is an integer number (1633075290).

Almost surely, 2^21668535335 is an apocalyptic number.

21668535335 is a deficient number, since it is larger than the sum of its proper divisors (4460669305).

21668535335 is a wasteful number, since it uses less digits than its factorization.

21668535335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13378.

The product of its digits is 1944000, while the sum is 47.

The spelling of 21668535335 in words is "twenty-one billion, six hundred sixty-eight million, five hundred thirty-five thousand, three hundred thirty-five".