21608243282638 has 8 divisors (see below), whose sum is σ = 33023918979288. Its totient is φ = 10600270289544.

The previous prime is 21608243282629. The next prime is 21608243282687. The reversal of 21608243282638 is 83628234280612.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 101925675756 + ... + 101925675967.

It is an arithmetic number, because the mean of its divisors is an integer number (4127989872411).

Almost surely, 2^{21608243282638} is an apocalyptic number.

21608243282638 is a deficient number, since it is larger than the sum of its proper divisors (11415675696650).

21608243282638 is a wasteful number, since it uses less digits than its factorization.

21608243282638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203851351778.

The product of its (nonzero) digits is 10616832, while the sum is 55.

The spelling of 21608243282638 in words is "twenty-one trillion, six hundred eight billion, two hundred forty-three million, two hundred eighty-two thousand, six hundred thirty-eight".