21002166606120 has 64 divisors (see below), whose sum is σ = 72007428366720. Its totient is φ = 4800495224064.

The previous prime is 21002166606119. The next prime is 21002166606131. The reversal of 21002166606120 is 2160666120012.

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, 12501288807 + ... + 12501290486.

It is an arithmetic number, because the mean of its divisors is an integer number (1125116068230).

Almost surely, 2^{21002166606120} is an apocalyptic number.

21002166606120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21002166606120 is an abundant number, since it is smaller than the sum of its proper divisors (51005261760600).

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

21002166606120 is a wasteful number, since it uses less digits than its factorization.

21002166606120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25002579314 (or 25002579310 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The spelling of 21002166606120 in words is "twenty-one trillion, two billion, one hundred sixty-six million, six hundred six thousand, one hundred twenty".