21304115273 has 4 divisors (see below), whose sum is σ = 24347560320. Its totient is φ = 18260670228.

The previous prime is 21304115257. The next prime is 21304115297. The reversal of 21304115273 is 37251140312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21304115273 - 2⁴ = 21304115257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21304115873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1521722513 + ... + 1521722526.

It is an arithmetic number, because the mean of its divisors is an integer number (6086890080).

Almost surely, 2^21304115273 is an apocalyptic number.

It is an amenable number.

21304115273 is a deficient number, since it is larger than the sum of its proper divisors (3043445047).

21304115273 is an equidigital number, since it uses as much as digits as its factorization.

21304115273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3043445046.

The product of its (nonzero) digits is 5040, while the sum is 29.

Adding to 21304115273 its reverse (37251140312), we get a palindrome (58555255585).

The spelling of 21304115273 in words is "twenty-one billion, three hundred four million, one hundred fifteen thousand, two hundred seventy-three".