21443421032 has 32 divisors (see below), whose sum is σ = 43885372320. Its totient is φ = 9741714240.

The previous prime is 21443421031. The next prime is 21443421037. The reversal of 21443421032 is 23012434412.

It is a junction number, because it is equal to n+sod(n) for n = 21443420992 and 21443421010.

It is not an unprimeable number, because it can be changed into a prime (21443421031) 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, 99038 + ... + 229554.

It is an arithmetic number, because the mean of its divisors is an integer number (1371417885).

Almost surely, 2^21443421032 is an apocalyptic number.

21443421032 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21443421032 is an abundant number, since it is smaller than the sum of its proper divisors (22441951288).

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

21443421032 is a wasteful number, since it uses less digits than its factorization.

21443421032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132401 (or 132397 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21443421032 its reverse (23012434412), we get a palindrome (44455855444).

The spelling of 21443421032 in words is "twenty-one billion, four hundred forty-three million, four hundred twenty-one thousand, thirty-two".