211954012265 has 4 divisors (see below), whose sum is σ = 254344814724. Its totient is φ = 169563209808.

The previous prime is 211954012223. The next prime is 211954012267. The reversal of 211954012265 is 562210459112.

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 161215098256 + 50738914009 = 401516^2 + 225253^2 .

It is a cyclic number.

It is not a de Polignac number, because 211954012265 - 2¹² = 211954008169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211954012267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21195401222 + ... + 21195401231.

It is an arithmetic number, because the mean of its divisors is an integer number (63586203681).

Almost surely, 2^211954012265 is an apocalyptic number.

It is an amenable number.

211954012265 is a deficient number, since it is larger than the sum of its proper divisors (42390802459).

211954012265 is an equidigital number, since it uses as much as digits as its factorization.

211954012265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42390802458.

The product of its (nonzero) digits is 43200, while the sum is 38.

The spelling of 211954012265 in words is "two hundred eleven billion, nine hundred fifty-four million, twelve thousand, two hundred sixty-five".