21120024000 has 112 divisors (see below), whose sum is σ = 69738398496. Its totient is φ = 5632000000.

The previous prime is 21120023987. The next prime is 21120024067. The reversal of 21120024000 is 42002112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

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, 416001 + ... + 464000.

Almost surely, 2^21120024000 is an apocalyptic number.

21120024000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21120024000 is an abundant number, since it is smaller than the sum of its proper divisors (48618374496).

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

21120024000 is an equidigital number, since it uses as much as digits as its factorization.

21120024000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880031 (or 880011 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21120024000 its reverse (42002112), we get a palindrome (21162026112).

The spelling of 21120024000 in words is "twenty-one billion, one hundred twenty million, twenty-four thousand".