21638456486629 has 16 divisors (see below), whose sum is σ = 21837713363200. Its totient is φ = 21440262076416.

The previous prime is 21638456486627. The next prime is 21638456486711. The reversal of 21638456486629 is 92668465483612.

It is a cyclic number.

It is not a de Polignac number, because 21638456486629 - 2¹ = 21638456486627 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 (21638456486623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50543332 + ... + 50969650.

It is an arithmetic number, because the mean of its divisors is an integer number (1364857085200).

Almost surely, 2^{21638456486629} is an apocalyptic number.

It is an amenable number.

21638456486629 is a deficient number, since it is larger than the sum of its proper divisors (199256876571).

21638456486629 is a wasteful number, since it uses less digits than its factorization.

21638456486629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427564.

The product of its digits is 716636160, while the sum is 70.

The spelling of 21638456486629 in words is "twenty-one trillion, six hundred thirty-eight billion, four hundred fifty-six million, four hundred eighty-six thousand, six hundred twenty-nine".