21703870187 has 8 divisors (see below), whose sum is σ = 22041608400. Its totient is φ = 21366537984.

The previous prime is 21703870171. The next prime is 21703870207. The reversal of 21703870187 is 78107830712.

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

It is not a de Polignac number, because 21703870187 - 2⁴ = 21703870171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21702870187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7139 + ... + 208467.

It is an arithmetic number, because the mean of its divisors is an integer number (2755201050).

Almost surely, 2^21703870187 is an apocalyptic number.

21703870187 is a deficient number, since it is larger than the sum of its proper divisors (337738213).

21703870187 is a wasteful number, since it uses less digits than its factorization.

21703870187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203005.

The product of its (nonzero) digits is 131712, while the sum is 44.

The spelling of 21703870187 in words is "twenty-one billion, seven hundred three million, eight hundred seventy thousand, one hundred eighty-seven".