21632142078287 has 4 divisors (see below), whose sum is σ = 23296153007400. Its totient is φ = 19968131149176.

The previous prime is 21632142078259. The next prime is 21632142078317. The reversal of 21632142078287 is 78287024123612.

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 21632142078287 - 2³⁸ = 21357264171343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21632142078187) 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, 832005464537 + ... + 832005464562.

It is an arithmetic number, because the mean of its divisors is an integer number (5824038251850).

Almost surely, 2^{21632142078287} is an apocalyptic number.

21632142078287 is a deficient number, since it is larger than the sum of its proper divisors (1664010929113).

21632142078287 is a wasteful number, since it uses less digits than its factorization.

21632142078287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664010929112.

The product of its (nonzero) digits is 3612672, while the sum is 53.

The spelling of 21632142078287 in words is "twenty-one trillion, six hundred thirty-two billion, one hundred forty-two million, seventy-eight thousand, two hundred eighty-seven".