21011010012847 has 2 divisors, whose sum is σ = 21011010012848. Its totient is φ = 21011010012846.

The previous prime is 21011010012829. The next prime is 21011010012877. The reversal of 21011010012847 is 74821001011012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011010012847 is a prime.

It is a super-3 number, since 3×21011010012847³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21011010012877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505505006423 + 10505505006424.

It is an arithmetic number, because the mean of its divisors is an integer number (10505505006424).

Almost surely, 2^{21011010012847} is an apocalyptic number.

21011010012847 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011010012847 is an equidigital number, since it uses as much as digits as its factorization.

21011010012847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 28.

Adding to 21011010012847 its reverse (74821001011012), we get a palindrome (95832011023859).

The spelling of 21011010012847 in words is "twenty-one trillion, eleven billion, ten million, twelve thousand, eight hundred forty-seven".