21543010144 has 24 divisors (see below), whose sum is σ = 42993803160. Its totient is φ = 10623949056.

The previous prime is 21543010123. The next prime is 21543010169. The reversal of 21543010144 is 44101034512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4608754 + ... + 4613425.

It is an arithmetic number, because the mean of its divisors is an integer number (1791408465).

Almost surely, 2^21543010144 is an apocalyptic number.

It is an amenable number.

21543010144 is a deficient number, since it is larger than the sum of its proper divisors (21450793016).

21543010144 is an equidigital number, since it uses as much as digits as its factorization.

21543010144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9222262 (or 9222254 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21543010144 its reverse (44101034512), we get a palindrome (65644044656).

The spelling of 21543010144 in words is "twenty-one billion, five hundred forty-three million, ten thousand, one hundred forty-four".