21368218304 has 28 divisors (see below), whose sum is σ = 42939309600. Its totient is φ = 10548864768.

The previous prime is 21368218303. The next prime is 21368218309. The reversal of 21368218304 is 40381286312.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21368218303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2108099 + ... + 2118210.

Almost surely, 2^21368218304 is an apocalyptic number.

It is an amenable number.

21368218304 is an abundant number, since it is smaller than the sum of its proper divisors (21571091296).

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

21368218304 is an equidigital number, since it uses as much as digits as its factorization.

21368218304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4226400 (or 4226390 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The spelling of 21368218304 in words is "twenty-one billion, three hundred sixty-eight million, two hundred eighteen thousand, three hundred four".