21432040044 has 192 divisors, whose sum is σ = 55599022080. Its totient is φ = 6404907520.

The previous prime is 21432040043. The next prime is 21432040151. The reversal of 21432040044 is 44004023412.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21432039996 and 21432040023.

It is not an unprimeable number, because it can be changed into a prime (21432040043) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 31378927 + ... + 31379609.

It is an arithmetic number, because the mean of its divisors is an integer number (289578240).

Almost surely, 2^21432040044 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 21432040044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27799511040).

21432040044 is an abundant number, since it is smaller than the sum of its proper divisors (34166982036).

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

21432040044 is a wasteful number, since it uses less digits than its factorization.

21432040044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860 (or 858 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

Adding to 21432040044 its reverse (44004023412), we get a palindrome (65436063456).

The spelling of 21432040044 in words is "twenty-one billion, four hundred thirty-two million, forty thousand, forty-four".