21432254044 has 12 divisors (see below), whose sum is σ = 37578437568. Its totient is φ = 10695557600.

The previous prime is 21432254021. The next prime is 21432254071. The reversal of 21432254044 is 44045223412.

It is a junction number, because it is equal to n+sod(n) for n = 21432253997 and 21432254015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5140012 + ... + 5144179.

It is an arithmetic number, because the mean of its divisors is an integer number (3131536464).

Almost surely, 2^21432254044 is an apocalyptic number.

It is an amenable number.

21432254044 is a deficient number, since it is larger than the sum of its proper divisors (16146183524).

21432254044 is a wasteful number, since it uses less digits than its factorization.

21432254044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10284716 (or 10284714 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 31.

Adding to 21432254044 its reverse (44045223412), we get a palindrome (65477477456).

The spelling of 21432254044 in words is "twenty-one billion, four hundred thirty-two million, two hundred fifty-four thousand, forty-four".