21841818366 has 32 divisors (see below), whose sum is σ = 45118706688. Its totient is φ = 7041697920.

The previous prime is 21841818359. The next prime is 21841818407. The reversal of 21841818366 is 66381814812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 299526 + ... + 365238.

It is an arithmetic number, because the mean of its divisors is an integer number (1409959584).

Almost surely, 2^21841818366 is an apocalyptic number.

21841818366 is an abundant number, since it is smaller than the sum of its proper divisors (23276888322).

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

21841818366 is a wasteful number, since it uses less digits than its factorization.

21841818366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67536.

The product of its digits is 442368, while the sum is 48.

The spelling of 21841818366 in words is "twenty-one billion, eight hundred forty-one million, eight hundred eighteen thousand, three hundred sixty-six".