21484779353 has 4 divisors (see below), whose sum is σ = 21485261028. Its totient is φ = 21484297680.

The previous prime is 21484779331. The next prime is 21484779361. The reversal of 21484779353 is 35397748412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10741871449 + 10742907904 = 103643^2 + 103648^2 .

It is a cyclic number.

It is not a de Polignac number, because 21484779353 - 2²⁶ = 21417670489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21484779295 and 21484779304.

It is not an unprimeable number, because it can be changed into a prime (21484779553) 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 3 ways as a sum of consecutive naturals, for example, 166226 + ... + 265707.

It is an arithmetic number, because the mean of its divisors is an integer number (5371315257).

Almost surely, 2^21484779353 is an apocalyptic number.

It is an amenable number.

21484779353 is a deficient number, since it is larger than the sum of its proper divisors (481675).

21484779353 is an equidigital number, since it uses as much as digits as its factorization.

21484779353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481674.

The product of its digits is 5080320, while the sum is 53.

The spelling of 21484779353 in words is "twenty-one billion, four hundred eighty-four million, seven hundred seventy-nine thousand, three hundred fifty-three".