21473084065 has 8 divisors (see below), whose sum is σ = 25770996648. Its totient is φ = 17176270080.

The previous prime is 21473084057. The next prime is 21473084069. The reversal of 21473084065 is 56048037412.

It can be written as a sum of positive squares in 4 ways, for example, as 945931536 + 20527152529 = 30756^2 + 143273^2 .

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

It is not a de Polignac number, because 21473084065 - 2³ = 21473084057 is a prime.

It is a super-2 number, since 2×21473084065² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21473084069) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 231016 + ... + 310345.

It is an arithmetic number, because the mean of its divisors is an integer number (3221374581).

Almost surely, 2^21473084065 is an apocalyptic number.

It is an amenable number.

21473084065 is a deficient number, since it is larger than the sum of its proper divisors (4297912583).

21473084065 is an equidigital number, since it uses as much as digits as its factorization.

21473084065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549299.

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 21473084065 in words is "twenty-one billion, four hundred seventy-three million, eighty-four thousand, sixty-five".