21440482465 has 8 divisors (see below), whose sum is σ = 26214024168. Its totient is φ = 16828755840.

The previous prime is 21440482457. The next prime is 21440482489. The reversal of 21440482465 is 56428404412.

It can be written as a sum of positive squares in 4 ways, for example, as 3250026081 + 18190456384 = 57009^2 + 134872^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21440482465 - 2³ = 21440482457 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40453476 + ... + 40454005.

It is an arithmetic number, because the mean of its divisors is an integer number (3276753021).

Almost surely, 2^21440482465 is an apocalyptic number.

It is an amenable number.

21440482465 is a deficient number, since it is larger than the sum of its proper divisors (4773541703).

21440482465 is an equidigital number, since it uses as much as digits as its factorization.

21440482465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80907539.

The product of its (nonzero) digits is 245760, while the sum is 40.

Adding to 21440482465 its reverse (56428404412), we get a palindrome (77868886877).

The spelling of 21440482465 in words is "twenty-one billion, four hundred forty million, four hundred eighty-two thousand, four hundred sixty-five".