21847865188907 has 2 divisors, whose sum is σ = 21847865188908. Its totient is φ = 21847865188906.

The previous prime is 21847865188871. The next prime is 21847865188957. The reversal of 21847865188907 is 70988156874812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21847865188907 - 2⁴² = 17449818677803 is a prime.

It is not a weakly prime, because it can be changed into another prime (21847865188957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10923932594453 + 10923932594454.

It is an arithmetic number, because the mean of its divisors is an integer number (10923932594454).

Almost surely, 2^{21847865188907} is an apocalyptic number.

21847865188907 is a deficient number, since it is larger than the sum of its proper divisors (1).

21847865188907 is an equidigital number, since it uses as much as digits as its factorization.

21847865188907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 433520640, while the sum is 74.

The spelling of 21847865188907 in words is "twenty-one trillion, eight hundred forty-seven billion, eight hundred sixty-five million, one hundred eighty-eight thousand, nine hundred seven".