21301260813266 has 24 divisors (see below), whose sum is σ = 37172793881340. Its totient is φ = 9128063653632.

The previous prime is 21301260813263. The next prime is 21301260813311. The reversal of 21301260813266 is 66231806210312.

It can be written as a sum of positive squares in 2 ways, for example, as 20502141029041 + 799119784225 = 4527929^2 + 893935^2 .

It is not an unprimeable number, because it can be changed into a prime (21301260813263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11619431 + ... + 13327178.

Almost surely, 2^{21301260813266} is an apocalyptic number.

21301260813266 is a deficient number, since it is larger than the sum of its proper divisors (15871533068074).

21301260813266 is a wasteful number, since it uses less digits than its factorization.

21301260813266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24955338 (or 24955331 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 21301260813266 in words is "twenty-one trillion, three hundred one billion, two hundred sixty million, eight hundred thirteen thousand, two hundred sixty-six".