21260543265303 has 4 divisors (see below), whose sum is σ = 28347391020408. Its totient is φ = 14173695510200.

The previous prime is 21260543265277. The next prime is 21260543265323. The reversal of 21260543265303 is 30356234506212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21260543265303 - 2⁵ = 21260543265271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21260543265323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3543423877548 + ... + 3543423877553.

It is an arithmetic number, because the mean of its divisors is an integer number (7086847755102).

Almost surely, 2^{21260543265303} is an apocalyptic number.

21260543265303 is a deficient number, since it is larger than the sum of its proper divisors (7086847755105).

21260543265303 is an equidigital number, since it uses as much as digits as its factorization.

21260543265303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7086847755104.

The product of its (nonzero) digits is 777600, while the sum is 42.

The spelling of 21260543265303 in words is "twenty-one trillion, two hundred sixty billion, five hundred forty-three million, two hundred sixty-five thousand, three hundred three".