21043242304 has 56 divisors (see below), whose sum is σ = 48832950848. Its totient is φ = 8808791040.

The previous prime is 21043242299. The next prime is 21043242329. The reversal of 21043242304 is 40324234012.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (56).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 526917 + ... + 565444.

Almost surely, 2^21043242304 is an apocalyptic number.

It is an amenable number.

21043242304 is an abundant number, since it is smaller than the sum of its proper divisors (27789708544).

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

21043242304 is a wasteful number, since it uses less digits than its factorization.

21043242304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092423 (or 1092413 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 21043242304 its reverse (40324234012), we get a palindrome (61367476316).

The spelling of 21043242304 in words is "twenty-one billion, forty-three million, two hundred forty-two thousand, three hundred four".