211746305281 has 15 divisors (see below), whose sum is σ = 247048964673. Its totient is φ = 181477506420.

The previous prime is 211746305279. The next prime is 211746305291. The reversal of 211746305281 is 182503647112.

The square root of 211746305281 is 460159.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 211746305281 - 2¹ = 211746305279 is a prime.

It is a super-2 number, since 2×211746305281² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211746305291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 22543096 + ... + 22552486.

Almost surely, 2^211746305281 is an apocalyptic number.

211746305281 is the 460159-th square number.

211746305281 is the 230080-th centered octagonal number.

It is an amenable number.

211746305281 is a deficient number, since it is larger than the sum of its proper divisors (35302659392).

211746305281 is an frugal number, since it uses more digits than its factorization.

211746305281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18810 (or 9398 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 211746305281 in words is "two hundred eleven billion, seven hundred forty-six million, three hundred five thousand, two hundred eighty-one".