21144066566887 has 8 divisors (see below), whose sum is σ = 23067037944720. Its totient is φ = 19221225773760.

The previous prime is 21144066566879. The next prime is 21144066566891. The reversal of 21144066566887 is 78866566044112.

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

It is a cyclic number.

It is not a de Polignac number, because 21144066566887 - 2³ = 21144066566879 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144066566867) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32307462 + ... + 32955427.

It is an arithmetic number, because the mean of its divisors is an integer number (2883379743090).

Almost surely, 2^{21144066566887} is an apocalyptic number.

21144066566887 is a deficient number, since it is larger than the sum of its proper divisors (1922971377833).

21144066566887 is a wasteful number, since it uses less digits than its factorization.

21144066566887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65292353.

The product of its (nonzero) digits is 92897280, while the sum is 64.

The spelling of 21144066566887 in words is "twenty-one trillion, one hundred forty-four billion, sixty-six million, five hundred sixty-six thousand, eight hundred eighty-seven".