21787672735 has 16 divisors (see below), whose sum is σ = 26841341952. Its totient is φ = 16969933600.

The previous prime is 21787672693. The next prime is 21787672741. The reversal of 21787672735 is 53727678712.

It is not a de Polignac number, because 21787672735 - 2⁷ = 21787672607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197821 + ... + 287590.

It is an arithmetic number, because the mean of its divisors is an integer number (1677583872).

Almost surely, 2^21787672735 is an apocalyptic number.

21787672735 is a deficient number, since it is larger than the sum of its proper divisors (5053669217).

21787672735 is a wasteful number, since it uses less digits than its factorization.

21787672735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485654.

The product of its digits is 6914880, while the sum is 55.

The spelling of 21787672735 in words is "twenty-one billion, seven hundred eighty-seven million, six hundred seventy-two thousand, seven hundred thirty-five".