21024303144 has 64 divisors (see below), whose sum is σ = 57153532800. Its totient is φ = 6406200576.

The previous prime is 21024303143. The next prime is 21024303227. The reversal of 21024303144 is 44130342012.

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

It is not an unprimeable number, because it can be changed into a prime (21024303143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 294979 + ... + 359250.

It is an arithmetic number, because the mean of its divisors is an integer number (893023950).

Almost surely, 2^21024303144 is an apocalyptic number.

21024303144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21024303144 is an abundant number, since it is smaller than the sum of its proper divisors (36129229656).

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

21024303144 is a wasteful number, since it uses less digits than its factorization.

21024303144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654354 (or 654350 counting only the distinct ones).

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

Adding to 21024303144 its reverse (44130342012), we get a palindrome (65154645156).

The spelling of 21024303144 in words is "twenty-one billion, twenty-four million, three hundred three thousand, one hundred forty-four".