21136234116205 has 16 divisors (see below), whose sum is σ = 27314613943344. Its totient is φ = 15608241100800.

The previous prime is 21136234116119. The next prime is 21136234116253. The reversal of 21136234116205 is 50261143263112.

It can be written as a sum of positive squares in 8 ways, for example, as 9648018727876 + 11488215388329 = 3106126^2 + 3389427^2 .

It is not a de Polignac number, because 21136234116205 - 2¹⁷ = 21136233985133 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34396155 + ... + 35005255.

It is an arithmetic number, because the mean of its divisors is an integer number (1707163371459).

Almost surely, 2^{21136234116205} is an apocalyptic number.

It is an amenable number.

21136234116205 is a deficient number, since it is larger than the sum of its proper divisors (6178379827139).

21136234116205 is a wasteful number, since it uses less digits than its factorization.

21136234116205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142976.

The product of its (nonzero) digits is 51840, while the sum is 37.

Adding to 21136234116205 its reverse (50261143263112), we get a palindrome (71397377379317).

The spelling of 21136234116205 in words is "twenty-one trillion, one hundred thirty-six billion, two hundred thirty-four million, one hundred sixteen thousand, two hundred five".