21201234444 has 72 divisors (see below), whose sum is σ = 57751296512. Its totient is φ = 6519294720.

The previous prime is 21201234427. The next prime is 21201234451. The reversal of 21201234444 is 44443210212.

21201234444 is a `hidden beast` number, since 212 + 0 + 1 + 2 + 3 + 4 + 444 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 764664 + ... + 791904.

Almost surely, 2^21201234444 is an apocalyptic number.

It is an amenable number.

21201234444 is an abundant number, since it is smaller than the sum of its proper divisors (36550062068).

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

21201234444 is a wasteful number, since it uses less digits than its factorization.

21201234444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28927 (or 28922 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 21201234444 its reverse (44443210212), we get a palindrome (65644444656).

The spelling of 21201234444 in words is "twenty-one billion, two hundred one million, two hundred thirty-four thousand, four hundred forty-four".