21320243102266 has 16 divisors (see below), whose sum is σ = 33686806196160. Its totient is φ = 10092083185440.

The previous prime is 21320243102261. The next prime is 21320243102293. The reversal of 21320243102266 is 66220134202312.

It is not an unprimeable number, because it can be changed into a prime (21320243102261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193814755 + ... + 193924726.

It is an arithmetic number, because the mean of its divisors is an integer number (2105425387260).

Almost surely, 2^{21320243102266} is an apocalyptic number.

21320243102266 is a deficient number, since it is larger than the sum of its proper divisors (12366563093894).

21320243102266 is a wasteful number, since it uses less digits than its factorization.

21320243102266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387740949.

The product of its (nonzero) digits is 41472, while the sum is 34.

Adding to 21320243102266 its reverse (66220134202312), we get a palindrome (87540377304578).

The spelling of 21320243102266 in words is "twenty-one trillion, three hundred twenty billion, two hundred forty-three million, one hundred two thousand, two hundred sixty-six".