211950943921 has 4 divisors (see below), whose sum is σ = 212127423844. Its totient is φ = 211774464000.

The previous prime is 211950943871. The next prime is 211950943949. The reversal of 211950943921 is 129349059112.

211950943921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 74917711521 + 137033232400 = 273711^2 + 370180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211950943921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211950943961) 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 3 ways as a sum of consecutive naturals, for example, 88238160 + ... + 88240561.

It is an arithmetic number, because the mean of its divisors is an integer number (53031855961).

Almost surely, 2^211950943921 is an apocalyptic number.

It is an amenable number.

211950943921 is a deficient number, since it is larger than the sum of its proper divisors (176479923).

211950943921 is a wasteful number, since it uses less digits than its factorization.

211950943921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176479922.

The product of its (nonzero) digits is 174960, while the sum is 46.

The spelling of 211950943921 in words is "two hundred eleven billion, nine hundred fifty million, nine hundred forty-three thousand, nine hundred twenty-one".