21708326636036 has 12 divisors (see below), whose sum is σ = 37992745693980. Its totient is φ = 10853256437760.

The previous prime is 21708326636023. The next prime is 21708326636041. The reversal of 21708326636036 is 63063662380712.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3838684073536 + 17869642562500 = 1959256^2 + 4227250^2 .

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, 226666205 + ... + 226761956.

It is an arithmetic number, because the mean of its divisors is an integer number (3166062141165).

Almost surely, 2^{21708326636036} is an apocalyptic number.

It is an amenable number.

21708326636036 is a deficient number, since it is larger than the sum of its proper divisors (16284419057944).

21708326636036 is a wasteful number, since it uses less digits than its factorization.

21708326636036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453440134 (or 453440132 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 53.

The spelling of 21708326636036 in words is "twenty-one trillion, seven hundred eight billion, three hundred twenty-six million, six hundred thirty-six thousand, thirty-six".