211386720981 has 8 divisors (see below), whose sum is σ = 282196497184. Its totient is φ = 140750712720.

The previous prime is 211386720947. The next prime is 211386721019. The reversal of 211386720981 is 189027683112.

211386720981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211386720981 - 2⁹ = 211386720469 is a prime.

It is a super-3 number, since 3×211386720981³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211386720981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211386720901) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 43439146 + ... + 43444011.

It is an arithmetic number, because the mean of its divisors is an integer number (35274562148).

Almost surely, 2^211386720981 is an apocalyptic number.

It is an amenable number.

211386720981 is a deficient number, since it is larger than the sum of its proper divisors (70809776203).

211386720981 is an equidigital number, since it uses as much as digits as its factorization.

211386720981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86883971.

The product of its (nonzero) digits is 290304, while the sum is 48.

The spelling of 211386720981 in words is "two hundred eleven billion, three hundred eighty-six million, seven hundred twenty thousand, nine hundred eighty-one".