211200211221 has 4 divisors (see below), whose sum is σ = 281600281632. Its totient is φ = 140800140812.

The previous prime is 211200211213. The next prime is 211200211237. The reversal of 211200211221 is 122112002112.

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 211200211221 - 2³ = 211200211213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211200211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211200211241) 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, 35200035201 + ... + 35200035206.

It is an arithmetic number, because the mean of its divisors is an integer number (70400070408).

Almost surely, 2^211200211221 is an apocalyptic number.

It is an amenable number.

211200211221 is a deficient number, since it is larger than the sum of its proper divisors (70400070411).

211200211221 is an equidigital number, since it uses as much as digits as its factorization.

211200211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70400070410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 211200211221 its reverse (122112002112), we get a palindrome (333312213333).

The spelling of 211200211221 in words is "two hundred eleven billion, two hundred million, two hundred eleven thousand, two hundred twenty-one".