211855350505 has 8 divisors (see below), whose sum is σ = 254229999624. Its totient is φ = 169481894400.

The previous prime is 211855350493. The next prime is 211855350541. The reversal of 211855350505 is 505053558112.

It can be written as a sum of positive squares in 4 ways, for example, as 91148440464 + 120706910041 = 301908^2 + 347429^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-211855350505 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 155065 + ... + 669145.

It is an arithmetic number, because the mean of its divisors is an integer number (31778749953).

Almost surely, 2^211855350505 is an apocalyptic number.

It is an amenable number.

211855350505 is a deficient number, since it is larger than the sum of its proper divisors (42374649119).

211855350505 is an equidigital number, since it uses as much as digits as its factorization.

211855350505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596507.

The product of its (nonzero) digits is 150000, while the sum is 40.

The spelling of 211855350505 in words is "two hundred eleven billion, eight hundred fifty-five million, three hundred fifty thousand, five hundred five".