21847439113739 has 2 divisors, whose sum is σ = 21847439113740. Its totient is φ = 21847439113738.

The previous prime is 21847439113723. The next prime is 21847439113793. The reversal of 21847439113739 is 93731193474812.

Together with next prime (21847439113793) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21847439113739 - 2⁴ = 21847439113723 is a prime.

It is not a weakly prime, because it can be changed into another prime (21847439113439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10923719556869 + 10923719556870.

It is an arithmetic number, because the mean of its divisors is an integer number (10923719556870).

Almost surely, 2^{21847439113739} is an apocalyptic number.

21847439113739 is a deficient number, since it is larger than the sum of its proper divisors (1).

21847439113739 is an equidigital number, since it uses as much as digits as its factorization.

21847439113739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27433728, while the sum is 62.

The spelling of 21847439113739 in words is "twenty-one trillion, eight hundred forty-seven billion, four hundred thirty-nine million, one hundred thirteen thousand, seven hundred thirty-nine".