21689403468433 has 8 divisors (see below), whose sum is σ = 22965293693160. Its totient is φ = 20413518017280.

The previous prime is 21689403468407. The next prime is 21689403468443. The reversal of 21689403468433 is 33486430498612.

It can be written as a sum of positive squares in 4 ways, for example, as 13169408745024 + 8519994723409 = 3628968^2 + 2918903^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21689403468433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21689403468443) 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 in 7 ways as a sum of consecutive naturals, for example, 12951183 + ... + 14529691.

It is an arithmetic number, because the mean of its divisors is an integer number (2870661711645).

Almost surely, 2^{21689403468433} is an apocalyptic number.

It is an amenable number.

21689403468433 is a deficient number, since it is larger than the sum of its proper divisors (1275890224727).

21689403468433 is a wasteful number, since it uses less digits than its factorization.

21689403468433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2386787.

The product of its (nonzero) digits is 71663616, while the sum is 61.

The spelling of 21689403468433 in words is "twenty-one trillion, six hundred eighty-nine billion, four hundred three million, four hundred sixty-eight thousand, four hundred thirty-three".