21917944086 has 8 divisors (see below), whose sum is σ = 43835888184. Its totient is φ = 7305981360.

The previous prime is 21917944067. The next prime is 21917944129. The reversal of 21917944086 is 68044971912.

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

21917944086 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1826495335 + ... + 1826495346.

It is an arithmetic number, because the mean of its divisors is an integer number (5479486023).

Almost surely, 2^21917944086 is an apocalyptic number.

21917944086 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21917944086 is a wasteful number, since it uses less digits than its factorization.

21917944086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3652990686.

The product of its (nonzero) digits is 870912, while the sum is 51.

The spelling of 21917944086 in words is "twenty-one billion, nine hundred seventeen million, nine hundred forty-four thousand, eighty-six".