21304504201 has 4 divisors (see below), whose sum is σ = 21991746304. Its totient is φ = 20617262100.

The previous prime is 21304504189. The next prime is 21304504213. The reversal of 21304504201 is 10240540312.

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 an interprime number because it is at equal distance from previous prime (21304504189) and next prime (21304504213).

It is a cyclic number.

It is not a de Polignac number, because 21304504201 - 2¹³ = 21304496009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21304504231) 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, 343621005 + ... + 343621066.

It is an arithmetic number, because the mean of its divisors is an integer number (5497936576).

Almost surely, 2^21304504201 is an apocalyptic number.

It is an amenable number.

21304504201 is a deficient number, since it is larger than the sum of its proper divisors (687242103).

21304504201 is an equidigital number, since it uses as much as digits as its factorization.

21304504201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687242102.

The product of its (nonzero) digits is 960, while the sum is 22.

The spelling of 21304504201 in words is "twenty-one billion, three hundred four million, five hundred four thousand, two hundred one".