21432103040 has 128 divisors (see below), whose sum is σ = 52158997440. Its totient is φ = 8419840000.

The previous prime is 21432103019. The next prime is 21432103051. The reversal of 21432103040 is 4030123412.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8466575 + ... + 8469105.

Almost surely, 2^21432103040 is an apocalyptic number.

21432103040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21432103040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26079498720).

21432103040 is an abundant number, since it is smaller than the sum of its proper divisors (30726894400).

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

21432103040 is a wasteful number, since it uses less digits than its factorization.

21432103040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2782 (or 2770 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21432103040 its reverse (4030123412), we get a palindrome (25462226452).

The spelling of 21432103040 in words is "twenty-one billion, four hundred thirty-two million, one hundred three thousand, forty".