21115355016066 has 32 divisors (see below), whose sum is σ = 44208521929728. Its totient is φ = 6710784329040.

The previous prime is 21115355016047. The next prime is 21115355016097. The reversal of 21115355016066 is 66061055351112.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245953576 + ... + 246039411.

It is an arithmetic number, because the mean of its divisors is an integer number (1381516310304).

Almost surely, 2^{21115355016066} is an apocalyptic number.

21115355016066 is an abundant number, since it is smaller than the sum of its proper divisors (23093166913662).

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

21115355016066 is a wasteful number, since it uses less digits than its factorization.

21115355016066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491993326.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 21115355016066 in words is "twenty-one trillion, one hundred fifteen billion, three hundred fifty-five million, sixteen thousand, sixty-six".