21866503455108 has 288 divisors, whose sum is σ = 64480172649984. Its totient is φ = 6186847371264.

The previous prime is 21866503455089. The next prime is 21866503455161. The reversal of 21866503455108 is 80155430566812.

21866503455108 is a `hidden beast` number, since 2 + 1 + 8 + 6 + 6 + 50 + 34 + 551 + 0 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 215708091 + ... + 215809437.

It is an arithmetic number, because the mean of its divisors is an integer number (223889488368).

Almost surely, 2^{21866503455108} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21866503455108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32240086324992).

21866503455108 is an abundant number, since it is smaller than the sum of its proper divisors (42613669194876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21866503455108 is a wasteful number, since it uses less digits than its factorization.

21866503455108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102011 (or 102006 counting only the distinct ones).

The product of its (nonzero) digits is 6912000, while the sum is 54.

The spelling of 21866503455108 in words is "twenty-one trillion, eight hundred sixty-six billion, five hundred three million, four hundred fifty-five thousand, one hundred eight".