21208880064307 has 24 divisors (see below), whose sum is σ = 23812980673776. Its totient is φ = 18764003066688.

The previous prime is 21208880064287. The next prime is 21208880064313. The reversal of 21208880064307 is 70346008880212.

It is a de Polignac number, because none of the positive numbers 2^k-21208880064307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21208880074307) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2752053 + ... + 7070470.

It is an arithmetic number, because the mean of its divisors is an integer number (992207528074).

Almost surely, 2^{21208880064307} is an apocalyptic number.

21208880064307 is a deficient number, since it is larger than the sum of its proper divisors (2604100609469).

21208880064307 is an equidigital number, since it uses as much as digits as its factorization.

21208880064307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9822707 (or 9822640 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 49.

The spelling of 21208880064307 in words is "twenty-one trillion, two hundred eight billion, eight hundred eighty million, sixty-four thousand, three hundred seven".