21304374617 has 4 divisors (see below), whose sum is σ = 21360000000. Its totient is φ = 21248749236.

The previous prime is 21304374607. The next prime is 21304374631. The reversal of 21304374617 is 71647340312.

It is a happy number.

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 21304374617 - 2⁴ = 21304374601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21304374607) 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, 27812117 + ... + 27812882.

It is an arithmetic number, because the mean of its divisors is an integer number (5340000000).

Almost surely, 2^21304374617 is an apocalyptic number.

It is an amenable number.

21304374617 is a deficient number, since it is larger than the sum of its proper divisors (55625383).

21304374617 is an equidigital number, since it uses as much as digits as its factorization.

21304374617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55625382.

The product of its (nonzero) digits is 84672, while the sum is 38.

The spelling of 21304374617 in words is "twenty-one billion, three hundred four million, three hundred seventy-four thousand, six hundred seventeen".