21838586209 has 8 divisors (see below), whose sum is σ = 23995308960. Its totient is φ = 19710429600.

The previous prime is 21838586201. The next prime is 21838586239. The reversal of 21838586209 is 90268583812.

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 21838586209 - 2³ = 21838586201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21838586201) 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, 7139932 + ... + 7142989.

It is an arithmetic number, because the mean of its divisors is an integer number (2999413620).

Almost surely, 2^21838586209 is an apocalyptic number.

It is an amenable number.

21838586209 is a deficient number, since it is larger than the sum of its proper divisors (2156722751).

21838586209 is a wasteful number, since it uses less digits than its factorization.

21838586209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14283071.

The product of its (nonzero) digits is 1658880, while the sum is 52.

The spelling of 21838586209 in words is "twenty-one billion, eight hundred thirty-eight million, five hundred eighty-six thousand, two hundred nine".