21663411124461 has 8 divisors (see below), whose sum is σ = 28922504211264. Its totient is φ = 14423296060320.

The previous prime is 21663411124379. The next prime is 21663411124469. The reversal of 21663411124461 is 16442111436612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21663411124461 - 2¹⁰ = 21663411123437 is a prime.

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 pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4744503001 + ... + 4744507566.

It is an arithmetic number, because the mean of its divisors is an integer number (3615313026408).

Almost surely, 2^{21663411124461} is an apocalyptic number.

It is an amenable number.

21663411124461 is a deficient number, since it is larger than the sum of its proper divisors (7259093086803).

21663411124461 is an equidigital number, since it uses as much as digits as its factorization.

21663411124461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9489011331.

The product of its digits is 165888, while the sum is 42.

The spelling of 21663411124461 in words is "twenty-one trillion, six hundred sixty-three billion, four hundred eleven million, one hundred twenty-four thousand, four hundred sixty-one".