21609324680 has 32 divisors (see below), whose sum is σ = 48630110400. Its totient is φ = 8642106816.

The previous prime is 21609324641. The next prime is 21609324697. The reversal of 21609324680 is 8642390612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177659 + ... + 273461.

It is an arithmetic number, because the mean of its divisors is an integer number (1519690950).

Almost surely, 2^21609324680 is an apocalyptic number.

21609324680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21609324680 is an abundant number, since it is smaller than the sum of its proper divisors (27020785720).

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

21609324680 is a wasteful number, since it uses less digits than its factorization.

21609324680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101453 (or 101449 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

It can be divided in two parts, 2160932 and 4680, that added together give a palindrome (2165612).

The spelling of 21609324680 in words is "twenty-one billion, six hundred nine million, three hundred twenty-four thousand, six hundred eighty".