211243240121 has 4 divisors (see below), whose sum is σ = 212022735744. Its totient is φ = 210463744500.

The previous prime is 211243240097. The next prime is 211243240177. The reversal of 211243240121 is 121042342112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211243240121 - 2⁶ = 211243240057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211243240921) 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, 389747405 + ... + 389747946.

It is an arithmetic number, because the mean of its divisors is an integer number (53005683936).

Almost surely, 2^211243240121 is an apocalyptic number.

It is an amenable number.

211243240121 is a deficient number, since it is larger than the sum of its proper divisors (779495623).

211243240121 is an equidigital number, since it uses as much as digits as its factorization.

211243240121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 779495622.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 211243240121 its reverse (121042342112), we get a palindrome (332285582233).

The spelling of 211243240121 in words is "two hundred eleven billion, two hundred forty-three million, two hundred forty thousand, one hundred twenty-one".