21184269913 has 4 divisors (see below), whose sum is σ = 21184700800. Its totient is φ = 21183839028.

The previous prime is 21184269907. The next prime is 21184269949. The reversal of 21184269913 is 31996248112.

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 21184269913 - 2²⁹ = 20647399001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21184269973) 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, 130545 + ... + 243742.

It is an arithmetic number, because the mean of its divisors is an integer number (5296175200).

Almost surely, 2^21184269913 is an apocalyptic number.

It is an amenable number.

21184269913 is a deficient number, since it is larger than the sum of its proper divisors (430887).

21184269913 is an equidigital number, since it uses as much as digits as its factorization.

21184269913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430886.

The product of its digits is 186624, while the sum is 46.

The spelling of 21184269913 in words is "twenty-one billion, one hundred eighty-four million, two hundred sixty-nine thousand, nine hundred thirteen".