211620240485 has 4 divisors (see below), whose sum is σ = 253944288588. Its totient is φ = 169296192384.

The previous prime is 211620240449. The next prime is 211620240493. The reversal of 211620240485 is 584042026112.

It is a Cunningham number, because it is equal to 460022²+1.

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 76183728196 + 135436512289 = 276014^2 + 368017^2 .

It is a cyclic number.

It is not a de Polignac number, because 211620240485 - 2⁸ = 211620240229 is a prime.

It is a Duffinian number.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 21162024044 + ... + 21162024053.

It is an arithmetic number, because the mean of its divisors is an integer number (63486072147).

Almost surely, 2^211620240485 is an apocalyptic number.

It is an amenable number.

211620240485 is a deficient number, since it is larger than the sum of its proper divisors (42324048103).

211620240485 is an equidigital number, since it uses as much as digits as its factorization.

211620240485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42324048102.

The product of its (nonzero) digits is 30720, while the sum is 35.

Adding to 211620240485 its reverse (584042026112), we get a palindrome (795662266597).

The spelling of 211620240485 in words is "two hundred eleven billion, six hundred twenty million, two hundred forty thousand, four hundred eighty-five".