21431036000 has 144 divisors (see below), whose sum is σ = 57879450720. Its totient is φ = 7792928000.

The previous prime is 21431035943. The next prime is 21431036021. The reversal of 21431036000 is 63013412.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 461861 + ... + 506139.

It is an arithmetic number, because the mean of its divisors is an integer number (401940630).

Almost surely, 2^21431036000 is an apocalyptic number.

21431036000 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 21431036000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28939725360).

21431036000 is an abundant number, since it is smaller than the sum of its proper divisors (36448414720).

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

21431036000 is a wasteful number, since it uses less digits than its factorization.

21431036000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44326 (or 44297 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21431036000 its reverse (63013412), we get a palindrome (21494049412).

The spelling of 21431036000 in words is "twenty-one billion, four hundred thirty-one million, thirty-six thousand".