21941688188 has 12 divisors (see below), whose sum is σ = 43883376432. Its totient is φ = 9403580640.

The previous prime is 21941688133. The next prime is 21941688191. The reversal of 21941688188 is 88188614912.

21941688188 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, 391815833 + ... + 391815888.

It is an arithmetic number, because the mean of its divisors is an integer number (3656948036).

Almost surely, 2^21941688188 is an apocalyptic number.

21941688188 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21941688188 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.

21941688188 is a wasteful number, since it uses less digits than its factorization.

21941688188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783631732 (or 783631730 counting only the distinct ones).

The product of its digits is 1769472, while the sum is 56.

The spelling of 21941688188 in words is "twenty-one billion, nine hundred forty-one million, six hundred eighty-eight thousand, one hundred eighty-eight".