21444401232 has 240 divisors, whose sum is σ = 62975397888. Its totient is φ = 6806292480.

The previous prime is 21444401227. The next prime is 21444401261. The reversal of 21444401232 is 23210444412.

21444401232 is a `hidden beast` number, since 21 + 4 + 4 + 4 + 401 + 232 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21444401196 and 21444401205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 68512308 + ... + 68512620.

Almost surely, 2^21444401232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21444401232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31487698944).

21444401232 is an abundant number, since it is smaller than the sum of its proper divisors (41530996656).

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

21444401232 is a wasteful number, since it uses less digits than its factorization.

21444401232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618 (or 609 counting only the distinct ones).

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

Adding to 21444401232 its reverse (23210444412), we get a palindrome (44654845644).

The spelling of 21444401232 in words is "twenty-one billion, four hundred forty-four million, four hundred one thousand, two hundred thirty-two".