2101305666205 has 4 divisors (see below), whose sum is σ = 2521566799452. Its totient is φ = 1681044532960.

The previous prime is 2101305666199. The next prime is 2101305666211. The reversal of 2101305666205 is 5026665031012.

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

It is an interprime number because it is at equal distance from previous prime (2101305666199) and next prime (2101305666211).

It can be written as a sum of positive squares in 2 ways, for example, as 1256062630564 + 845243035641 = 1120742^2 + 919371^2 .

It is not a de Polignac number, because 2101305666205 - 2¹⁵ = 2101305633437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210130566616 + ... + 210130566625.

It is an arithmetic number, because the mean of its divisors is an integer number (630391699863).

Almost surely, 2^{2101305666205} is an apocalyptic number.

It is an amenable number.

2101305666205 is a deficient number, since it is larger than the sum of its proper divisors (420261133247).

2101305666205 is an equidigital number, since it uses as much as digits as its factorization.

2101305666205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420261133246.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 2101305666205 in words is "two trillion, one hundred one billion, three hundred five million, six hundred sixty-six thousand, two hundred five".