21045024000 has 1728 divisors, whose sum is σ = 103067048448. Its totient is φ = 3981312000.

The previous prime is 21045023929. The next prime is 21045024037. The reversal of 21045024000 is 42054012.

21045024000 is a `hidden beast` number, since 210 + 4 + 50 + 2 + 400 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 288287964 + ... + 288288036.

Almost surely, 2^21045024000 is an apocalyptic number.

21045024000 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 21045024000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51533524224).

21045024000 is an abundant number, since it is smaller than the sum of its proper divisors (82022024448).

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

21045024000 is a wasteful number, since it uses less digits than its factorization.

21045024000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

Adding to 21045024000 its reverse (42054012), we get a palindrome (21087078012).

The spelling of 21045024000 in words is "twenty-one billion, forty-five million, twenty-four thousand".