21144232000 has 112 divisors (see below), whose sum is σ = 54053475840. Its totient is φ = 8184768000.

The previous prime is 21144231971. The next prime is 21144232007. The reversal of 21144232000 is 23244112.

It is not an unprimeable number, because it can be changed into a prime (21144232007) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 205371 + ... + 290629.

It is an arithmetic number, because the mean of its divisors is an integer number (482620320).

Almost surely, 2^21144232000 is an apocalyptic number.

21144232000 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 21144232000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27026737920).

21144232000 is an abundant number, since it is smaller than the sum of its proper divisors (32909243840).

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

21144232000 is an equidigital number, since it uses as much as digits as its factorization.

21144232000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85317 (or 85297 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21144232000 its reverse (23244112), we get a palindrome (21167476112).

The spelling of 21144232000 in words is "twenty-one billion, one hundred forty-four million, two hundred thirty-two thousand".