211420220243 has 4 divisors (see below), whose sum is σ = 212351587080. Its totient is φ = 210488853408.

The previous prime is 211420220237. The next prime is 211420220269. The reversal of 211420220243 is 342022024112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 211420220243 - 2⁸ = 211420219987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211420220213) 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, 465683078 + ... + 465683531.

It is an arithmetic number, because the mean of its divisors is an integer number (53087896770).

Almost surely, 2^211420220243 is an apocalyptic number.

211420220243 is a deficient number, since it is larger than the sum of its proper divisors (931366837).

211420220243 is an equidigital number, since it uses as much as digits as its factorization.

211420220243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931366836.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 211420220243 its reverse (342022024112), we get a palindrome (553442244355).

The spelling of 211420220243 in words is "two hundred eleven billion, four hundred twenty million, two hundred twenty thousand, two hundred forty-three".