21004224304 has 20 divisors (see below), whose sum is σ = 46509354064. Its totient is φ = 9001810368.

The previous prime is 21004224287. The next prime is 21004224337. The reversal of 21004224304 is 40342240012.

It is a happy number.

It is a super-2 number, since 2×21004224304² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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, 93768747 + ... + 93768970.

Almost surely, 2^21004224304 is an apocalyptic number.

It is an amenable number.

21004224304 is an abundant number, since it is smaller than the sum of its proper divisors (25505129760).

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

21004224304 is a wasteful number, since it uses less digits than its factorization.

21004224304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187537732 (or 187537726 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

Adding to 21004224304 its reverse (40342240012), we get a palindrome (61346464316).

The spelling of 21004224304 in words is "twenty-one billion, four million, two hundred twenty-four thousand, three hundred four".