21507460044663 has 4 divisors (see below), whose sum is σ = 28676613392888. Its totient is φ = 14338306696440.

The previous prime is 21507460044617. The next prime is 21507460044677. The reversal of 21507460044663 is 36644006470512.

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

It is not a de Polignac number, because 21507460044663 - 2⁶ = 21507460044599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21507460044683) 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 3 ways as a sum of consecutive naturals, for example, 3584576674108 + ... + 3584576674113.

It is an arithmetic number, because the mean of its divisors is an integer number (7169153348222).

Almost surely, 2^{21507460044663} is an apocalyptic number.

21507460044663 is a deficient number, since it is larger than the sum of its proper divisors (7169153348225).

21507460044663 is an equidigital number, since it uses as much as digits as its factorization.

21507460044663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7169153348224.

The product of its (nonzero) digits is 2903040, while the sum is 48.

The spelling of 21507460044663 in words is "twenty-one trillion, five hundred seven billion, four hundred sixty million, forty-four thousand, six hundred sixty-three".