21443055432 has 32 divisors (see below), whose sum is σ = 54915144480. Its totient is φ = 6973351040.

The previous prime is 21443055427. The next prime is 21443055433. The reversal of 21443055432 is 23455034412.

It is a junction number, because it is equal to n+sod(n) for n = 21443055393 and 21443055402.

It is not an unprimeable number, because it can be changed into a prime (21443055433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10894878 + ... + 10896845.

It is an arithmetic number, because the mean of its divisors is an integer number (1716098265).

Almost surely, 2^21443055432 is an apocalyptic number.

It is an amenable number.

21443055432 is an abundant number, since it is smaller than the sum of its proper divisors (33472089048).

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

21443055432 is a wasteful number, since it uses less digits than its factorization.

21443055432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21791773 (or 21791769 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 33.

Adding to 21443055432 its reverse (23455034412), we get a palindrome (44898089844).

The spelling of 21443055432 in words is "twenty-one billion, four hundred forty-three million, fifty-five thousand, four hundred thirty-two".