21386255606 has 8 divisors (see below), whose sum is σ = 32310170760. Its totient is φ = 10616198688.

The previous prime is 21386255591. The next prime is 21386255617. The reversal of 21386255606 is 60655268312.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38464211 + ... + 38464766.

It is an arithmetic number, because the mean of its divisors is an integer number (4038771345).

Almost surely, 2^21386255606 is an apocalyptic number.

21386255606 is a deficient number, since it is larger than the sum of its proper divisors (10923915154).

21386255606 is a wasteful number, since it uses less digits than its factorization.

21386255606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76929118.

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 21386255606 in words is "twenty-one billion, three hundred eighty-six million, two hundred fifty-five thousand, six hundred six".