21844188216 has 80 divisors (see below), whose sum is σ = 64783041840. Its totient is φ = 6853075200.

The previous prime is 21844188151. The next prime is 21844188217. The reversal of 21844188216 is 61288144812.

21844188216 is a `hidden beast` number, since 2 + 18 + 4 + 418 + 8 + 216 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21844188217) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 980460 + ... + 1002491.

It is an arithmetic number, because the mean of its divisors is an integer number (809788023).

Almost surely, 2^21844188216 is an apocalyptic number.

It is an amenable number.

21844188216 is an abundant number, since it is smaller than the sum of its proper divisors (42938853624).

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

21844188216 is a wasteful number, since it uses less digits than its factorization.

21844188216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982986 (or 1982973 counting only the distinct ones).

The product of its digits is 196608, while the sum is 45.

The spelling of 21844188216 in words is "twenty-one billion, eight hundred forty-four million, one hundred eighty-eight thousand, two hundred sixteen".