21444432228 has 36 divisors (see below), whose sum is σ = 54227916288. Its totient is φ = 7145354160.

The previous prime is 21444432221. The next prime is 21444432239. The reversal of 21444432228 is 82223444412.

21444432228 is a `hidden beast` number, since 214 + 4 + 4 + 432 + 2 + 2 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21444432192 and 21444432201.

It is not an unprimeable number, because it can be changed into a prime (21444432221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21676 + ... + 208227.

It is an arithmetic number, because the mean of its divisors is an integer number (1506331008).

Almost surely, 2^21444432228 is an apocalyptic number.

It is an amenable number.

21444432228 is an abundant number, since it is smaller than the sum of its proper divisors (32783484060).

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

21444432228 is a wasteful number, since it uses less digits than its factorization.

21444432228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232504 (or 232499 counting only the distinct ones).

The product of its digits is 98304, while the sum is 36.

The spelling of 21444432228 in words is "twenty-one billion, four hundred forty-four million, four hundred thirty-two thousand, two hundred twenty-eight".