21170860702225 has 12 divisors (see below), whose sum is σ = 28271241676636. Its totient is φ = 15633866364480.

The previous prime is 21170860702207. The next prime is 21170860702249. The reversal of 21170860702225 is 52220706807112.

It can be written as a sum of positive squares in 6 ways, for example, as 9095242652224 + 12075618050001 = 3015832^2 + 3474999^2 .

It is not a de Polignac number, because 21170860702225 - 2¹³ = 21170860694033 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32570554602 + ... + 32570555251.

Almost surely, 2^{21170860702225} is an apocalyptic number.

21170860702225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21170860702225 is a deficient number, since it is larger than the sum of its proper divisors (7100380974411).

21170860702225 is a wasteful number, since it uses less digits than its factorization.

21170860702225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65141109876 (or 65141109871 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 43.

The spelling of 21170860702225 in words is "twenty-one trillion, one hundred seventy billion, eight hundred sixty million, seven hundred two thousand, two hundred twenty-five".