21838703867 has 4 divisors (see below), whose sum is σ = 21839927280. Its totient is φ = 21837480456.

The previous prime is 21838703839. The next prime is 21838703881. The reversal of 21838703867 is 76830783812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21838703867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21838703807) 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, 584528 + ... + 620765.

It is an arithmetic number, because the mean of its divisors is an integer number (5459981820).

Almost surely, 2^21838703867 is an apocalyptic number.

21838703867 is a deficient number, since it is larger than the sum of its proper divisors (1223413).

21838703867 is a wasteful number, since it uses less digits than its factorization.

21838703867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223412.

The product of its (nonzero) digits is 2709504, while the sum is 53.

The spelling of 21838703867 in words is "twenty-one billion, eight hundred thirty-eight million, seven hundred three thousand, eight hundred sixty-seven".