21409470288 has 80 divisors (see below), whose sum is σ = 62211891200. Its totient is φ = 7136478432.

The previous prime is 21409470283. The next prime is 21409470289. The reversal of 21409470288 is 88207490412.

21409470288 is a `hidden beast` number, since 214 + 0 + 94 + 70 + 288 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21409470283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 270928 + ... + 340911.

It is an arithmetic number, because the mean of its divisors is an integer number (777648640).

Almost surely, 2^21409470288 is an apocalyptic number.

It is an amenable number.

21409470288 is an abundant number, since it is smaller than the sum of its proper divisors (40802420912).

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

21409470288 is an frugal number, since it uses more digits than its factorization.

21409470288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611868 (or 611844 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The spelling of 21409470288 in words is "twenty-one billion, four hundred nine million, four hundred seventy thousand, two hundred eighty-eight".