21011212200005 has 8 divisors (see below), whose sum is σ = 25213481040024. Its totient is φ = 16808952160000.

The previous prime is 21011212200001. The next prime is 21011212200029. The reversal of 21011212200005 is 50000221211012.

It can be written as a sum of positive squares in 4 ways, for example, as 676866552961 + 20334345647044 = 822719^2 + 4509362^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21011212200005 - 2² = 21011212200001 is a prime.

It is a super-2 number, since 2×21011212200005² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011212200001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5507705 + ... + 8506305.

It is an arithmetic number, because the mean of its divisors is an integer number (3151685130003).

Almost surely, 2^{21011212200005} is an apocalyptic number.

It is an amenable number.

21011212200005 is a deficient number, since it is larger than the sum of its proper divisors (4202268840019).

21011212200005 is a wasteful number, since it uses less digits than its factorization.

21011212200005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4400007.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 21011212200005 its reverse (50000221211012), we get a palindrome (71011433411017).

The spelling of 21011212200005 in words is "twenty-one trillion, eleven billion, two hundred twelve million, two hundred thousand, five".