21263413566003 has 16 divisors (see below), whose sum is σ = 32540453876736. Its totient is φ = 12098373871680.

The previous prime is 21263413565971. The next prime is 21263413566007. The reversal of 21263413566003 is 30066531436212.

It is not a de Polignac number, because 21263413566003 - 2⁵ = 21263413565971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21263413566007) 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 15 ways as a sum of consecutive naturals, for example, 2172835243 + ... + 2172845028.

It is an arithmetic number, because the mean of its divisors is an integer number (2033778367296).

Almost surely, 2^{21263413566003} is an apocalyptic number.

21263413566003 is a deficient number, since it is larger than the sum of its proper divisors (11277040310733).

21263413566003 is a wasteful number, since it uses less digits than its factorization.

21263413566003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4345680514.

The product of its (nonzero) digits is 466560, while the sum is 42.

The spelling of 21263413566003 in words is "twenty-one trillion, two hundred sixty-three billion, four hundred thirteen million, five hundred sixty-six thousand, three".