21301808416 has 36 divisors (see below), whose sum is σ = 48784948758. Its totient is φ = 9129345792.

The previous prime is 21301808377. The next prime is 21301808569. The reversal of 21301808416 is 61480810312.

It can be written as a sum of positive squares in only one way, i.e., 12201411600 + 9100396816 = 110460^2 + 95396^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6791101 + ... + 6794236.

Almost surely, 2^21301808416 is an apocalyptic number.

It is an amenable number.

21301808416 is an abundant number, since it is smaller than the sum of its proper divisors (27483140342).

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

21301808416 is a wasteful number, since it uses less digits than its factorization.

21301808416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13585361 (or 13585346 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The spelling of 21301808416 in words is "twenty-one billion, three hundred one million, eight hundred eight thousand, four hundred sixteen".