21553243304 has 16 divisors (see below), whose sum is σ = 41174828820. Its totient is φ = 10573288960.

The previous prime is 21553243253. The next prime is 21553243307. The reversal of 21553243304 is 40334235512.

It can be written as a sum of positive squares in 2 ways, for example, as 20808062500 + 745180804 = 144250^2 + 27298^2 .

It is not an unprimeable number, because it can be changed into a prime (21553243307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25416137 + ... + 25416984.

Almost surely, 2^21553243304 is an apocalyptic number.

It is an amenable number.

21553243304 is a deficient number, since it is larger than the sum of its proper divisors (19621585516).

21553243304 is a wasteful number, since it uses less digits than its factorization.

21553243304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50833180 (or 50833176 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 32.

Adding to 21553243304 its reverse (40334235512), we get a palindrome (61887478816).

The spelling of 21553243304 in words is "twenty-one billion, five hundred fifty-three million, two hundred forty-three thousand, three hundred four".