21047186347 has 8 divisors (see below), whose sum is σ = 23079535920. Its totient is φ = 19034664960.

The previous prime is 21047186323. The next prime is 21047186353. The reversal of 21047186347 is 74368174012.

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 21047186347 - 2¹⁵ = 21047153579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21047186387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4954822 + ... + 4959067.

It is an arithmetic number, because the mean of its divisors is an integer number (2884941990).

Almost surely, 2^21047186347 is an apocalyptic number.

21047186347 is a deficient number, since it is larger than the sum of its proper divisors (2032349573).

21047186347 is a wasteful number, since it uses less digits than its factorization.

21047186347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9914093.

The product of its (nonzero) digits is 225792, while the sum is 43.

The spelling of 21047186347 in words is "twenty-one billion, forty-seven million, one hundred eighty-six thousand, three hundred forty-seven".