21663411124463 has 4 divisors (see below), whose sum is σ = 22937729425920. Its totient is φ = 20389092823008.

The previous prime is 21663411124379. The next prime is 21663411124469. The reversal of 21663411124463 is 36442111436612.

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 21663411124463 - 2¹⁰ = 21663411123439 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 (21663411124469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637159150703 + ... + 637159150736.

It is an arithmetic number, because the mean of its divisors is an integer number (5734432356480).

Almost surely, 2^{21663411124463} is an apocalyptic number.

21663411124463 is a deficient number, since it is larger than the sum of its proper divisors (1274318301457).

21663411124463 is a wasteful number, since it uses less digits than its factorization.

21663411124463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274318301456.

The product of its digits is 497664, while the sum is 44.

The spelling of 21663411124463 in words is "twenty-one trillion, six hundred sixty-three billion, four hundred eleven million, one hundred twenty-four thousand, four hundred sixty-three".