21432004000 has 144 divisors (see below), whose sum is σ = 57882064968. Its totient is φ = 7793280000.

The previous prime is 21432003979. The next prime is 21432004001. The reversal of 21432004000 is 40023412.

It can be written as a sum of positive squares in 4 ways, for example, as 3575561616 + 17856442384 = 59796^2 + 133628^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (21432004001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 461860 + ... + 506140.

Almost surely, 2^21432004000 is an apocalyptic number.

21432004000 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 21432004000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28941032484).

21432004000 is an abundant number, since it is smaller than the sum of its proper divisors (36450060968).

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

21432004000 is a wasteful number, since it uses less digits than its factorization.

21432004000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44328 (or 44299 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 21432004000 its reverse (40023412), we get a palindrome (21472027412).

The spelling of 21432004000 in words is "twenty-one billion, four hundred thirty-two million, four thousand".