2181707747273 has 2 divisors, whose sum is σ = 2181707747274. Its totient is φ = 2181707747272.

The previous prime is 2181707747269. The next prime is 2181707747309. The reversal of 2181707747273 is 3727477071812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2144268206224 + 37439541049 = 1464332^2 + 193493^2 .

It is a cyclic number.

It is not a de Polignac number, because 2181707747273 - 2² = 2181707747269 is a prime.

It is a super-2 number, since 2×2181707747273² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2181707747243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1090853873636 + 1090853873637.

It is an arithmetic number, because the mean of its divisors is an integer number (1090853873637).

Almost surely, 2^{2181707747273} is an apocalyptic number.

It is an amenable number.

2181707747273 is a deficient number, since it is larger than the sum of its proper divisors (1).

2181707747273 is an equidigital number, since it uses as much as digits as its factorization.

2181707747273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6453888, while the sum is 56.

The spelling of 2181707747273 in words is "two trillion, one hundred eighty-one billion, seven hundred seven million, seven hundred forty-seven thousand, two hundred seventy-three".