212287302581 has 4 divisors (see below), whose sum is σ = 214389157164. Its totient is φ = 210185448000.

The previous prime is 212287302551. The next prime is 212287302659. The reversal of 212287302581 is 185203782212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 163693068100 + 48594234481 = 404590^2 + 220441^2 .

It is a cyclic number.

It is not a de Polignac number, because 212287302581 - 2²² = 212283108277 is a prime.

It is a super-2 number, since 2×212287302581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212287302551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1050927140 + ... + 1050927341.

It is an arithmetic number, because the mean of its divisors is an integer number (53597289291).

Almost surely, 2^212287302581 is an apocalyptic number.

It is an amenable number.

212287302581 is a deficient number, since it is larger than the sum of its proper divisors (2101854583).

212287302581 is a wasteful number, since it uses less digits than its factorization.

212287302581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101854582.

The product of its (nonzero) digits is 107520, while the sum is 41.

The spelling of 212287302581 in words is "two hundred twelve billion, two hundred eighty-seven million, three hundred two thousand, five hundred eighty-one".