21708326636038 has 16 divisors (see below), whose sum is σ = 37214659620864. Its totient is φ = 9303472211400.

The previous prime is 21708326636023. The next prime is 21708326636041. The reversal of 21708326636038 is 83063662380712.

It is a self number, because there is not a number n which added to its sum of digits gives 21708326636038.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6620220 + ... + 9340447.

It is an arithmetic number, because the mean of its divisors is an integer number (2325916226304).

Almost surely, 2^{21708326636038} is an apocalyptic number.

21708326636038 is a deficient number, since it is larger than the sum of its proper divisors (15506332984826).

21708326636038 is a wasteful number, since it uses less digits than its factorization.

21708326636038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16057827.

The product of its (nonzero) digits is 10450944, while the sum is 55.

The spelling of 21708326636038 in words is "twenty-one trillion, seven hundred eight billion, three hundred twenty-six million, six hundred thirty-six thousand, thirty-eight".