21124040304 has 20 divisors (see below), whose sum is σ = 54570437576. Its totient is φ = 7041346752.

The previous prime is 21124040303. The next prime is 21124040309. The reversal of 21124040304 is 40304042112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124040303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220042039 + ... + 220042134.

Almost surely, 2^21124040304 is an apocalyptic number.

21124040304 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21124040304 is an abundant number, since it is smaller than the sum of its proper divisors (33446397272).

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

21124040304 is a wasteful number, since it uses less digits than its factorization.

21124040304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440084184 (or 440084178 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21124040304 its reverse (40304042112), we get a palindrome (61428082416).

The spelling of 21124040304 in words is "twenty-one billion, one hundred twenty-four million, forty thousand, three hundred four".