21668683335 has 32 divisors (see below), whose sum is σ = 38541232128. Its totient is φ = 10323538560.

The previous prime is 21668683307. The next prime is 21668683369. The reversal of 21668683335 is 53338686612.

It is a happy number.

It is not a de Polignac number, because 21668683335 - 2⁵ = 21668683303 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 31 ways as a sum of consecutive naturals, for example, 1786237 + ... + 1798326.

It is an arithmetic number, because the mean of its divisors is an integer number (1204413504).

Almost surely, 2^21668683335 is an apocalyptic number.

21668683335 is a deficient number, since it is larger than the sum of its proper divisors (16872548793).

21668683335 is a wasteful number, since it uses less digits than its factorization.

21668683335 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3584615.

The product of its digits is 3732480, while the sum is 51.

The spelling of 21668683335 in words is "twenty-one billion, six hundred sixty-eight million, six hundred eighty-three thousand, three hundred thirty-five".