21303204144 has 80 divisors (see below), whose sum is σ = 56143094112. Its totient is φ = 6958209024.

The previous prime is 21303204133. The next prime is 21303204151. The reversal of 21303204144 is 44140230312.

It is a Harshad number since it is a multiple of its sum of digits (24).

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, 2165124 + ... + 2174940.

Almost surely, 2^21303204144 is an apocalyptic number.

21303204144 is a gapful number since it is divisible by the number (24) 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 21303204144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28071547056).

21303204144 is an abundant number, since it is smaller than the sum of its proper divisors (34839889968).

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

21303204144 is a wasteful number, since it uses less digits than its factorization.

21303204144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10734 (or 10728 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21303204144 its reverse (44140230312), we get a palindrome (65443434456).

The spelling of 21303204144 in words is "twenty-one billion, three hundred three million, two hundred four thousand, one hundred forty-four".