21228847934347 has 4 divisors (see below), whose sum is σ = 21228905091240. Its totient is φ = 21228790777456.

The previous prime is 21228847934279. The next prime is 21228847934369. The reversal of 21228847934347 is 74343974882212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21228847934347 - 2¹⁵ = 21228847901579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21228847934377) 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, 28017658 + ... + 28765375.

It is an arithmetic number, because the mean of its divisors is an integer number (5307226272810).

Almost surely, 2^{21228847934347} is an apocalyptic number.

21228847934347 is a deficient number, since it is larger than the sum of its proper divisors (57156893).

21228847934347 is an equidigital number, since it uses as much as digits as its factorization.

21228847934347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57156892.

The product of its digits is 130056192, while the sum is 64.

The spelling of 21228847934347 in words is "twenty-one trillion, two hundred twenty-eight billion, eight hundred forty-seven million, nine hundred thirty-four thousand, three hundred forty-seven".