21123024000 has 256 divisors, whose sum is σ = 75411423360. Its totient is φ = 5199360000.

The previous prime is 21123023993. The next prime is 21123024011. The reversal of 21123024000 is 42032112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 607075 + ... + 640925.

Almost surely, 2^21123024000 is an apocalyptic number.

21123024000 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 21123024000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37705711680).

21123024000 is an abundant number, since it is smaller than the sum of its proper divisors (54288399360).

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

21123024000 is a wasteful number, since it uses less digits than its factorization.

21123024000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33896 (or 33874 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21123024000 its reverse (42032112), we get a palindrome (21165056112).

The spelling of 21123024000 in words is "twenty-one billion, one hundred twenty-three million, twenty-four thousand".