21047184289 has 8 divisors (see below), whose sum is σ = 21341173760. Its totient is φ = 20753348256.

The previous prime is 21047184281. The next prime is 21047184331. The reversal of 21047184289 is 98248174012.

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

It is a cyclic number.

It is not a de Polignac number, because 21047184289 - 2³ = 21047184281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21047184281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 253252 + ... + 325930.

It is an arithmetic number, because the mean of its divisors is an integer number (2667646720).

Almost surely, 2^21047184289 is an apocalyptic number.

It is an amenable number.

21047184289 is a deficient number, since it is larger than the sum of its proper divisors (293989471).

21047184289 is an equidigital number, since it uses as much as digits as its factorization.

21047184289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76719.

The product of its (nonzero) digits is 258048, while the sum is 46.

The spelling of 21047184289 in words is "twenty-one billion, forty-seven million, one hundred eighty-four thousand, two hundred eighty-nine".