21610606117 has 2 divisors, whose sum is σ = 21610606118. Its totient is φ = 21610606116.

The previous prime is 21610606051. The next prime is 21610606123. The reversal of 21610606117 is 71160601612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14411762401 + 7198843716 = 120049^2 + 84846^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21610606117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21610606217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10805303058 + 10805303059.

It is an arithmetic number, because the mean of its divisors is an integer number (10805303059).

Almost surely, 2^21610606117 is an apocalyptic number.

It is an amenable number.

21610606117 is a deficient number, since it is larger than the sum of its proper divisors (1).

21610606117 is an equidigital number, since it uses as much as digits as its factorization.

21610606117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

The spelling of 21610606117 in words is "twenty-one billion, six hundred ten million, six hundred six thousand, one hundred seventeen".