21243304704 has 36 divisors (see below), whose sum is σ = 56538172376. Its totient is φ = 7081101312.

The previous prime is 21243304699. The next prime is 21243304739. The reversal of 21243304704 is 40740334212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13829509 + ... + 13831044.

Almost surely, 2^21243304704 is an apocalyptic number.

21243304704 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21243304704 is an abundant number, since it is smaller than the sum of its proper divisors (35294867672).

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

21243304704 is an equidigital number, since it uses as much as digits as its factorization.

21243304704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27660572 (or 27660558 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 30.

Adding to 21243304704 its reverse (40740334212), we get a palindrome (61983638916).

The spelling of 21243304704 in words is "twenty-one billion, two hundred forty-three million, three hundred four thousand, seven hundred four".