21361650062666 has 8 divisors (see below), whose sum is σ = 32045646704544. Its totient is φ = 10679767827820.

The previous prime is 21361650062653. The next prime is 21361650062741. The reversal of 21361650062666 is 66626005616312.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 528576500 + ... + 528616911.

It is an arithmetic number, because the mean of its divisors is an integer number (4005705838068).

Almost surely, 2^{21361650062666} is an apocalyptic number.

21361650062666 is a deficient number, since it is larger than the sum of its proper divisors (10683996641878).

21361650062666 is a wasteful number, since it uses less digits than its factorization.

21361650062666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057203516.

The product of its (nonzero) digits is 2799360, while the sum is 50.

Adding to 21361650062666 its reverse (66626005616312), we get a palindrome (87987655678978).

The spelling of 21361650062666 in words is "twenty-one trillion, three hundred sixty-one billion, six hundred fifty million, sixty-two thousand, six hundred sixty-six".