21444005632 has 108 divisors (see below), whose sum is σ = 52722200160. Its totient is φ = 8649596928.

The previous prime is 21444005629. The next prime is 21444005651. The reversal of 21444005632 is 23650044412.

It is a junction number, because it is equal to n+sod(n) for n = 21444005594 and 21444005603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162969 + ... + 263527.

It is an arithmetic number, because the mean of its divisors is an integer number (488168520).

Almost surely, 2^21444005632 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 21444005632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26361100080).

21444005632 is an abundant number, since it is smaller than the sum of its proper divisors (31278194528).

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

21444005632 is a wasteful number, since it uses less digits than its factorization.

21444005632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100606 (or 100585 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 31.

The spelling of 21444005632 in words is "twenty-one billion, four hundred forty-four million, five thousand, six hundred thirty-two".